Precalculus Examples

$\cot (x) \sec^{4} (x) = \cot (x) + 2 \tan (x) + \tan^{3} (x)$

Step 1

Simplify the left side.

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Step 1.1

Simplify $\cot (x) \sec^{4} (x)$ .

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Step 1.1.1

Rewrite $\cot (x)$ in terms of sines and cosines.

$\frac{\cos (x)}{\sin (x)} \sec^{4} (x) = \cot (x) + 2 \tan (x) + \tan^{3} (x)$

Step 1.1.2

Rewrite $\sec (x)$ in terms of sines and cosines.

$\frac{\cos (x)}{\sin (x)} {(\frac{1}{\cos (x)})}^{4} = \cot (x) + 2 \tan (x) + \tan^{3} (x)$

Step 1.1.3

Simplify the expression.

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Step 1.1.3.1

Apply the product rule to $\frac{1}{\cos (x)}$ .

$\frac{\cos (x)}{\sin (x)} \cdot \frac{1^{4}}{\cos^{4} (x)} = \cot (x) + 2 \tan (x) + \tan^{3} (x)$

Step 1.1.3.2

One to any power is one.

$\frac{\cos (x)}{\sin (x)} \cdot \frac{1}{\cos^{4} (x)} = \cot (x) + 2 \tan (x) + \tan^{3} (x)$

Step 1.1.4

Multiply $\frac{\cos (x)}{\sin (x)}$ by $\frac{1}{\cos^{4} (x)}$ .

$\frac{\cos (x)}{\sin (x) \cos^{4} (x)} = \cot (x) + 2 \tan (x) + \tan^{3} (x)$

Step 1.1.5

Cancel the common factor of $\cos (x)$ and $\cos^{4} (x)$ .

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Step 1.1.5.1

Multiply by $1$ .

$\frac{\cos (x) \cdot 1}{\sin (x) \cos^{4} (x)} = \cot (x) + 2 \tan (x) + \tan^{3} (x)$

Step 1.1.5.2

Cancel the common factors.

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Step 1.1.5.2.1

Factor $\cos (x)$ out of $\sin (x) \cos^{4} (x)$ .

$\frac{\cos (x) \cdot 1}{\cos (x) (\sin (x) \cos^{3} (x))} = \cot (x) + 2 \tan (x) + \tan^{3} (x)$

Step 1.1.5.2.2

Cancel the common factor.

$\frac{\cos (x) \cdot 1}{\cos (x) (\sin (x) \cos^{3} (x))} = \cot (x) + 2 \tan (x) + \tan^{3} (x)$

Step 1.1.5.2.3

Rewrite the expression.

$\frac{1}{\sin (x) \cos^{3} (x)} = \cot (x) + 2 \tan (x) + \tan^{3} (x)$

Step 1.1.6

Separate fractions.

$\frac{1}{\cos^{3} (x)} \cdot \frac{1}{\sin (x)} = \cot (x) + 2 \tan (x) + \tan^{3} (x)$

Step 1.1.7

Convert from $\frac{1}{\sin (x)}$ to $\csc (x)$ .

$\frac{1}{\cos^{3} (x)} \csc (x) = \cot (x) + 2 \tan (x) + \tan^{3} (x)$

Step 1.1.8

Combine $\frac{1}{\cos^{3} (x)}$ and $\csc (x)$ .

$\frac{\csc (x)}{\cos^{3} (x)} = \cot (x) + 2 \tan (x) + \tan^{3} (x)$

Step 1.1.9

Factor $\cos (x)$ out of $\cos^{3} (x)$ .

$\frac{\csc (x)}{\cos (x) \cos^{2} (x)} = \cot (x) + 2 \tan (x) + \tan^{3} (x)$

Step 1.1.10

Separate fractions.

$\frac{1}{\cos^{2} (x)} \cdot \frac{\csc (x)}{\cos (x)} = \cot (x) + 2 \tan (x) + \tan^{3} (x)$

Step 1.1.11

Rewrite $\csc (x)$ in terms of sines and cosines.

$\frac{1}{\cos^{2} (x)} \cdot \frac{\frac{1}{\sin (x)}}{\cos (x)} = \cot (x) + 2 \tan (x) + \tan^{3} (x)$

Step 1.1.12

Rewrite $\frac{\frac{1}{\sin (x)}}{\cos (x)}$ as a product.

$\frac{1}{\cos^{2} (x)} (\frac{1}{\sin (x)} \cdot \frac{1}{\cos (x)}) = \cot (x) + 2 \tan (x) + \tan^{3} (x)$

Step 1.1.13

Simplify.

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Step 1.1.13.1

Convert from $\frac{1}{\sin (x)}$ to $\csc (x)$ .

$\frac{1}{\cos^{2} (x)} (\csc (x) \frac{1}{\cos (x)}) = \cot (x) + 2 \tan (x) + \tan^{3} (x)$

Step 1.1.13.2

Convert from $\frac{1}{\cos (x)}$ to $\sec (x)$ .

$\frac{1}{\cos^{2} (x)} (\csc (x) \sec (x)) = \cot (x) + 2 \tan (x) + \tan^{3} (x)$

Step 1.1.14

Rewrite $1$ as $1^{2}$ .

$\frac{1^{2}}{\cos^{2} (x)} (\csc (x) \sec (x)) = \cot (x) + 2 \tan (x) + \tan^{3} (x)$

Step 1.1.15

Rewrite $\frac{1^{2}}{\cos^{2} (x)}$ as ${(\frac{1}{\cos (x)})}^{2}$ .

${(\frac{1}{\cos (x)})}^{2} (\csc (x) \sec (x)) = \cot (x) + 2 \tan (x) + \tan^{3} (x)$

Step 1.1.16

Convert from $\frac{1}{\cos (x)}$ to $\sec (x)$ .

$\sec^{2} (x) (\csc (x) \sec (x)) = \cot (x) + 2 \tan (x) + \tan^{3} (x)$

Step 1.1.17

Multiply $\sec^{2} (x)$ by $\sec (x)$ by adding the exponents.

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Step 1.1.17.1

Move $\sec (x)$ .

$\sec (x) \sec^{2} (x) \csc (x) = \cot (x) + 2 \tan (x) + \tan^{3} (x)$

Step 1.1.17.2

Multiply $\sec (x)$ by $\sec^{2} (x)$ .

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Step 1.1.17.2.1

Raise $\sec (x)$ to the power of $1$ .

$\sec^{1} (x) \sec^{2} (x) \csc (x) = \cot (x) + 2 \tan (x) + \tan^{3} (x)$

Step 1.1.17.2.2

Use the power rule $a^{m} a^{n} = a^{m + n}$ to combine exponents.

${\sec (x)}^{1 + 2} \csc (x) = \cot (x) + 2 \tan (x) + \tan^{3} (x)$

Step 1.1.17.3

Add $1$ and $2$ .

$\sec^{3} (x) \csc (x) = \cot (x) + 2 \tan (x) + \tan^{3} (x)$

Step 2

Since $x$ is on the right side of the equation, switch the sides so it is on the left side of the equation.

$\cot (x) + 2 \tan (x) + \tan^{3} (x) = \sec^{3} (x) \csc (x)$

Step 3

Simplify the left side.

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Step 3.1

Simplify each term.

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Step 3.1.1

Rewrite $\cot (x)$ in terms of sines and cosines.

$\frac{\cos (x)}{\sin (x)} + 2 \tan (x) + \tan^{3} (x) = \sec^{3} (x) \csc (x)$

Step 3.1.2

Rewrite $\tan (x)$ in terms of sines and cosines.

$\frac{\cos (x)}{\sin (x)} + 2 \frac{\sin (x)}{\cos (x)} + \tan^{3} (x) = \sec^{3} (x) \csc (x)$

Step 3.1.3

Combine $2$ and $\frac{\sin (x)}{\cos (x)}$ .

$\frac{\cos (x)}{\sin (x)} + \frac{2 \sin (x)}{\cos (x)} + \tan^{3} (x) = \sec^{3} (x) \csc (x)$

Step 3.1.4

Rewrite $\tan (x)$ in terms of sines and cosines.

$\frac{\cos (x)}{\sin (x)} + \frac{2 \sin (x)}{\cos (x)} + {(\frac{\sin (x)}{\cos (x)})}^{3} = \sec^{3} (x) \csc (x)$

Step 3.1.5

Apply the product rule to $\frac{\sin (x)}{\cos (x)}$ .

$\frac{\cos (x)}{\sin (x)} + \frac{2 \sin (x)}{\cos (x)} + \frac{\sin^{3} (x)}{\cos^{3} (x)} = \sec^{3} (x) \csc (x)$

Step 4

Simplify the right side.

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Step 4.1

Simplify $\sec^{3} (x) \csc (x)$ .

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Step 4.1.1

Rewrite $\sec (x)$ in terms of sines and cosines.

$\frac{\cos (x)}{\sin (x)} + \frac{2 \sin (x)}{\cos (x)} + \frac{\sin^{3} (x)}{\cos^{3} (x)} = {(\frac{1}{\cos (x)})}^{3} \csc (x)$

Step 4.1.2

Apply the product rule to $\frac{1}{\cos (x)}$ .

$\frac{\cos (x)}{\sin (x)} + \frac{2 \sin (x)}{\cos (x)} + \frac{\sin^{3} (x)}{\cos^{3} (x)} = \frac{1^{3}}{\cos^{3} (x)} \csc (x)$

Step 4.1.3

One to any power is one.

$\frac{\cos (x)}{\sin (x)} + \frac{2 \sin (x)}{\cos (x)} + \frac{\sin^{3} (x)}{\cos^{3} (x)} = \frac{1}{\cos^{3} (x)} \csc (x)$

Step 4.1.4

Rewrite $\csc (x)$ in terms of sines and cosines.

$\frac{\cos (x)}{\sin (x)} + \frac{2 \sin (x)}{\cos (x)} + \frac{\sin^{3} (x)}{\cos^{3} (x)} = \frac{1}{\cos^{3} (x)} \cdot \frac{1}{\sin (x)}$

Step 4.1.5

Combine.

$\frac{\cos (x)}{\sin (x)} + \frac{2 \sin (x)}{\cos (x)} + \frac{\sin^{3} (x)}{\cos^{3} (x)} = \frac{1 \cdot 1}{\cos^{3} (x) \sin (x)}$

Step 4.1.6

Multiply $1$ by $1$ .

$\frac{\cos (x)}{\sin (x)} + \frac{2 \sin (x)}{\cos (x)} + \frac{\sin^{3} (x)}{\cos^{3} (x)} = \frac{1}{\cos^{3} (x) \sin (x)}$

Step 5

Multiply both sides of the equation by $\sin (x)$ .

$\sin (x) (\frac{\cos (x)}{\sin (x)} + \frac{2 \sin (x)}{\cos (x)} + \frac{\sin^{3} (x)}{\cos^{3} (x)}) = \sin (x) \frac{1}{\cos^{3} (x) \sin (x)}$

Step 6

Apply the distributive property.

$\sin (x) \frac{\cos (x)}{\sin (x)} + \sin (x) \frac{2 \sin (x)}{\cos (x)} + \sin (x) \frac{\sin^{3} (x)}{\cos^{3} (x)} = \sin (x) \frac{1}{\cos^{3} (x) \sin (x)}$

Step 7

Simplify.

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Step 7.1

Cancel the common factor of $\sin (x)$ .

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Step 7.1.1

Cancel the common factor.

$\sin (x) \frac{\cos (x)}{\sin (x)} + \sin (x) \frac{2 \sin (x)}{\cos (x)} + \sin (x) \frac{\sin^{3} (x)}{\cos^{3} (x)} = \sin (x) \frac{1}{\cos^{3} (x) \sin (x)}$

Step 7.1.2

Rewrite the expression.

$\cos (x) + \sin (x) \frac{2 \sin (x)}{\cos (x)} + \sin (x) \frac{\sin^{3} (x)}{\cos^{3} (x)} = \sin (x) \frac{1}{\cos^{3} (x) \sin (x)}$

Step 7.2

Multiply $\sin (x) \frac{2 \sin (x)}{\cos (x)}$ .

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Step 7.2.1

Combine $\sin (x)$ and $\frac{2 \sin (x)}{\cos (x)}$ .

$\cos (x) + \frac{\sin (x) (2 \sin (x))}{\cos (x)} + \sin (x) \frac{\sin^{3} (x)}{\cos^{3} (x)} = \sin (x) \frac{1}{\cos^{3} (x) \sin (x)}$

Step 7.2.2

Raise $\sin (x)$ to the power of $1$ .

$\cos (x) + \frac{2 (\sin^{1} (x) \sin (x))}{\cos (x)} + \sin (x) \frac{\sin^{3} (x)}{\cos^{3} (x)} = \sin (x) \frac{1}{\cos^{3} (x) \sin (x)}$

Step 7.2.3

Raise $\sin (x)$ to the power of $1$ .

$\cos (x) + \frac{2 (\sin^{1} (x) \sin^{1} (x))}{\cos (x)} + \sin (x) \frac{\sin^{3} (x)}{\cos^{3} (x)} = \sin (x) \frac{1}{\cos^{3} (x) \sin (x)}$

Step 7.2.4

Use the power rule $a^{m} a^{n} = a^{m + n}$ to combine exponents.

$\cos (x) + \frac{2 {\sin (x)}^{1 + 1}}{\cos (x)} + \sin (x) \frac{\sin^{3} (x)}{\cos^{3} (x)} = \sin (x) \frac{1}{\cos^{3} (x) \sin (x)}$

Step 7.2.5

Add $1$ and $1$ .

$\cos (x) + \frac{2 \sin^{2} (x)}{\cos (x)} + \sin (x) \frac{\sin^{3} (x)}{\cos^{3} (x)} = \sin (x) \frac{1}{\cos^{3} (x) \sin (x)}$

Step 7.3

Multiply $\sin (x) \frac{\sin^{3} (x)}{\cos^{3} (x)}$ .

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Step 7.3.1

Combine $\sin (x)$ and $\frac{\sin^{3} (x)}{\cos^{3} (x)}$ .

$\cos (x) + \frac{2 \sin^{2} (x)}{\cos (x)} + \frac{\sin (x) \sin^{3} (x)}{\cos^{3} (x)} = \sin (x) \frac{1}{\cos^{3} (x) \sin (x)}$

Step 7.3.2

Multiply $\sin (x)$ by $\sin^{3} (x)$ by adding the exponents.

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Step 7.3.2.1

Multiply $\sin (x)$ by $\sin^{3} (x)$ .

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Step 7.3.2.1.1

Raise $\sin (x)$ to the power of $1$ .

$\cos (x) + \frac{2 \sin^{2} (x)}{\cos (x)} + \frac{\sin^{1} (x) \sin^{3} (x)}{\cos^{3} (x)} = \sin (x) \frac{1}{\cos^{3} (x) \sin (x)}$

Step 7.3.2.1.2

Use the power rule $a^{m} a^{n} = a^{m + n}$ to combine exponents.

$\cos (x) + \frac{2 \sin^{2} (x)}{\cos (x)} + \frac{{\sin (x)}^{1 + 3}}{\cos^{3} (x)} = \sin (x) \frac{1}{\cos^{3} (x) \sin (x)}$

Step 7.3.2.2

Add $1$ and $3$ .

$\cos (x) + \frac{2 \sin^{2} (x)}{\cos (x)} + \frac{\sin^{4} (x)}{\cos^{3} (x)} = \sin (x) \frac{1}{\cos^{3} (x) \sin (x)}$

Step 8

Cancel the common factor of $\sin (x)$ .

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Step 8.1

Factor $\sin (x)$ out of $\cos^{3} (x) \sin (x)$ .

$\cos (x) + \frac{2 \sin^{2} (x)}{\cos (x)} + \frac{\sin^{4} (x)}{\cos^{3} (x)} = \sin (x) \frac{1}{\sin (x) \cos^{3} (x)}$

Step 8.2

Cancel the common factor.

$\cos (x) + \frac{2 \sin^{2} (x)}{\cos (x)} + \frac{\sin^{4} (x)}{\cos^{3} (x)} = \sin (x) \frac{1}{\sin (x) \cos^{3} (x)}$

Step 8.3

Rewrite the expression.

$\cos (x) + \frac{2 \sin^{2} (x)}{\cos (x)} + \frac{\sin^{4} (x)}{\cos^{3} (x)} = \frac{1}{\cos^{3} (x)}$

Step 9

Subtract $\frac{1}{\cos^{3} (x)}$ from both sides of the equation.

$\cos (x) + \frac{2 \sin^{2} (x)}{\cos (x)} + \frac{\sin^{4} (x)}{\cos^{3} (x)} - \frac{1}{\cos^{3} (x)} = 0$

Step 10

Simplify each term.

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Step 10.1

Factor $\sin (x)$ out of $\sin^{2} (x)$ .

$\cos (x) + \frac{2 (\sin (x) \sin (x))}{\cos (x)} + \frac{\sin^{4} (x)}{\cos^{3} (x)} - \frac{1}{\cos^{3} (x)} = 0$

Step 10.2

Separate fractions.

$\cos (x) + \frac{2 (\sin (x))}{1} \cdot \frac{\sin (x)}{\cos (x)} + \frac{\sin^{4} (x)}{\cos^{3} (x)} - \frac{1}{\cos^{3} (x)} = 0$

Step 10.3

Convert from $\frac{\sin (x)}{\cos (x)}$ to $\tan (x)$ .

$\cos (x) + \frac{2 (\sin (x))}{1} \tan (x) + \frac{\sin^{4} (x)}{\cos^{3} (x)} - \frac{1}{\cos^{3} (x)} = 0$

Step 10.4

Divide $2 (\sin (x))$ by $1$ .

$\cos (x) + 2 (\sin (x)) \tan (x) + \frac{\sin^{4} (x)}{\cos^{3} (x)} - \frac{1}{\cos^{3} (x)} = 0$

Step 10.5

Factor $\sin^{3} (x)$ out of $\sin^{4} (x)$ .

$\cos (x) + 2 \sin (x) \tan (x) + \frac{\sin^{3} (x) \sin (x)}{\cos^{3} (x)} - \frac{1}{\cos^{3} (x)} = 0$

Step 10.6

Multiply by $1$ .

$\cos (x) + 2 \sin (x) \tan (x) + \frac{\sin^{3} (x) \sin (x)}{\cos^{3} (x) \cdot 1} - \frac{1}{\cos^{3} (x)} = 0$

Step 10.7

Separate fractions.

$\cos (x) + 2 \sin (x) \tan (x) + \frac{\sin (x)}{1} \cdot \frac{\sin^{3} (x)}{\cos^{3} (x)} - \frac{1}{\cos^{3} (x)} = 0$

Step 10.8

Convert from $\frac{\sin^{3} (x)}{\cos^{3} (x)}$ to $\tan^{3} (x)$ .

$\cos (x) + 2 \sin (x) \tan (x) + \frac{\sin (x)}{1} \tan^{3} (x) - \frac{1}{\cos^{3} (x)} = 0$

Step 10.9

Divide $\sin (x)$ by $1$ .

$\cos (x) + 2 \sin (x) \tan (x) + \sin (x) \tan^{3} (x) - \frac{1}{\cos^{3} (x)} = 0$

Step 11

Divide each term in the equation by $\cos (x)$ .

$\frac{\cos (x)}{\cos (x)} + \frac{2 \sin (x) \tan (x)}{\cos (x)} + \frac{\sin (x) \tan^{3} (x)}{\cos (x)} + \frac{- \frac{1}{\cos^{3} (x)}}{\cos (x)} = \frac{0}{\cos (x)}$

Step 12

Cancel the common factor of $\cos (x)$ .

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Step 12.1

Cancel the common factor.

$\frac{\cos (x)}{\cos (x)} + \frac{2 \sin (x) \tan (x)}{\cos (x)} + \frac{\sin (x) \tan^{3} (x)}{\cos (x)} + \frac{- \frac{1}{\cos^{3} (x)}}{\cos (x)} = \frac{0}{\cos (x)}$

Step 12.2

Rewrite the expression.

$1 + \frac{2 \sin (x) \tan (x)}{\cos (x)} + \frac{\sin (x) \tan^{3} (x)}{\cos (x)} + \frac{- \frac{1}{\cos^{3} (x)}}{\cos (x)} = \frac{0}{\cos (x)}$

Step 13

Simplify the numerator.

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Step 13.1

Rewrite $\tan (x)$ in terms of sines and cosines.

$1 + \frac{2 \sin (x) (\frac{\sin (x)}{\cos (x)})}{\cos (x)} + \frac{\sin (x) \tan^{3} (x)}{\cos (x)} + \frac{- \frac{1}{\cos^{3} (x)}}{\cos (x)} = \frac{0}{\cos (x)}$

Step 13.2

Combine exponents.

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Step 13.2.1

Combine $\frac{\sin (x)}{\cos (x)}$ and $2$ .

$1 + \frac{\frac{\sin (x) \cdot 2}{\cos (x)} \cdot \sin (x)}{\cos (x)} + \frac{\sin (x) \tan^{3} (x)}{\cos (x)} + \frac{- \frac{1}{\cos^{3} (x)}}{\cos (x)} = \frac{0}{\cos (x)}$

Step 13.2.2

Combine $\frac{\sin (x) \cdot 2}{\cos (x)}$ and $\sin (x)$ .

$1 + \frac{\frac{\sin (x) \cdot (2 \sin (x))}{\cos (x)}}{\cos (x)} + \frac{\sin (x) \tan^{3} (x)}{\cos (x)} + \frac{- \frac{1}{\cos^{3} (x)}}{\cos (x)} = \frac{0}{\cos (x)}$

Step 13.2.3

Raise $\sin (x)$ to the power of $1$ .

$1 + \frac{\frac{2 (\sin (x) \sin (x))}{\cos (x)}}{\cos (x)} + \frac{\sin (x) \tan^{3} (x)}{\cos (x)} + \frac{- \frac{1}{\cos^{3} (x)}}{\cos (x)} = \frac{0}{\cos (x)}$

Step 13.2.4

Raise $\sin (x)$ to the power of $1$ .

$1 + \frac{\frac{2 (\sin (x) \sin (x))}{\cos (x)}}{\cos (x)} + \frac{\sin (x) \tan^{3} (x)}{\cos (x)} + \frac{- \frac{1}{\cos^{3} (x)}}{\cos (x)} = \frac{0}{\cos (x)}$

Step 13.2.5

Use the power rule $a^{m} a^{n} = a^{m + n}$ to combine exponents.

$1 + \frac{\frac{2 {\sin (x)}^{1 + 1}}{\cos (x)}}{\cos (x)} + \frac{\sin (x) \tan^{3} (x)}{\cos (x)} + \frac{- \frac{1}{\cos^{3} (x)}}{\cos (x)} = \frac{0}{\cos (x)}$

Step 13.2.6

Add $1$ and $1$ .

$1 + \frac{\frac{2 \sin^{2} (x)}{\cos (x)}}{\cos (x)} + \frac{\sin (x) \tan^{3} (x)}{\cos (x)} + \frac{- \frac{1}{\cos^{3} (x)}}{\cos (x)} = \frac{0}{\cos (x)}$

Step 14

Multiply the numerator by the reciprocal of the denominator.

$1 + \frac{2 \sin^{2} (x)}{\cos (x)} \cdot \frac{1}{\cos (x)} + \frac{\sin (x) \tan^{3} (x)}{\cos (x)} + \frac{- \frac{1}{\cos^{3} (x)}}{\cos (x)} = \frac{0}{\cos (x)}$

Step 15

Combine fractions.

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Step 15.1

Combine.

$1 + \frac{2 \sin^{2} (x) \cdot 1}{\cos (x) \cos (x)} + \frac{\sin (x) \tan^{3} (x)}{\cos (x)} + \frac{- \frac{1}{\cos^{3} (x)}}{\cos (x)} = \frac{0}{\cos (x)}$

Step 15.2

Multiply $2$ by $1$ .

$1 + \frac{2 \sin^{2} (x)}{\cos (x) \cos (x)} + \frac{\sin (x) \tan^{3} (x)}{\cos (x)} + \frac{- \frac{1}{\cos^{3} (x)}}{\cos (x)} = \frac{0}{\cos (x)}$

Step 16

Simplify the denominator.

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Step 16.1

Use the power rule $a^{m} a^{n} = a^{m + n}$ to combine exponents.

$1 + \frac{2 \sin^{2} (x)}{{\cos (x)}^{1 + 1}} + \frac{\sin (x) \tan^{3} (x)}{\cos (x)} + \frac{- \frac{1}{\cos^{3} (x)}}{\cos (x)} = \frac{0}{\cos (x)}$

Step 16.2

Add $1$ and $1$ .

$1 + \frac{2 \sin^{2} (x)}{\cos^{2} (x)} + \frac{\sin (x) \tan^{3} (x)}{\cos (x)} + \frac{- \frac{1}{\cos^{3} (x)}}{\cos (x)} = \frac{0}{\cos (x)}$

Step 17

Multiply by $1$ .

$1 + \frac{2 (\sin^{2} (x) \cdot 1)}{\cos^{2} (x)} + \frac{\sin (x) \tan^{3} (x)}{\cos (x)} + \frac{- \frac{1}{\cos^{3} (x)}}{\cos (x)} = \frac{0}{\cos (x)}$

Step 18

Multiply by $1$ .

$1 + \frac{2 (\sin^{2} (x) \cdot 1)}{\cos^{2} (x) \cdot 1} + \frac{\sin (x) \tan^{3} (x)}{\cos (x)} + \frac{- \frac{1}{\cos^{3} (x)}}{\cos (x)} = \frac{0}{\cos (x)}$

Step 19

Separate fractions.

$1 + \frac{2 \cdot (1)}{1} \cdot \frac{\sin^{2} (x)}{\cos^{2} (x)} + \frac{\sin (x) \tan^{3} (x)}{\cos (x)} + \frac{- \frac{1}{\cos^{3} (x)}}{\cos (x)} = \frac{0}{\cos (x)}$

Step 20

Convert from $\frac{\sin^{2} (x)}{\cos^{2} (x)}$ to $\tan^{2} (x)$ .

$1 + \frac{2 \cdot (1)}{1} \cdot \tan^{2} (x) + \frac{\sin (x) \tan^{3} (x)}{\cos (x)} + \frac{- \frac{1}{\cos^{3} (x)}}{\cos (x)} = \frac{0}{\cos (x)}$

Step 21

Multiply $2$ by $1$ .

$1 + \frac{2}{1} \cdot \tan^{2} (x) + \frac{\sin (x) \tan^{3} (x)}{\cos (x)} + \frac{- \frac{1}{\cos^{3} (x)}}{\cos (x)} = \frac{0}{\cos (x)}$

Step 22

Divide $2$ by $1$ .

$1 + 2 \tan^{2} (x) + \frac{\sin (x) \tan^{3} (x)}{\cos (x)} + \frac{- \frac{1}{\cos^{3} (x)}}{\cos (x)} = \frac{0}{\cos (x)}$

Step 23

Simplify the numerator.

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Step 23.1

Rewrite $\tan (x)$ in terms of sines and cosines.

$1 + 2 \tan^{2} (x) + \frac{\sin (x) {(\frac{\sin (x)}{\cos (x)})}^{3}}{\cos (x)} + \frac{- \frac{1}{\cos^{3} (x)}}{\cos (x)} = \frac{0}{\cos (x)}$

Step 23.2

Apply the product rule to $\frac{\sin (x)}{\cos (x)}$ .

$1 + 2 \tan^{2} (x) + \frac{\sin (x) (\frac{\sin^{3} (x)}{\cos^{3} (x)})}{\cos (x)} + \frac{- \frac{1}{\cos^{3} (x)}}{\cos (x)} = \frac{0}{\cos (x)}$

Step 24

Combine $\sin (x)$ and $\frac{\sin^{3} (x)}{\cos^{3} (x)}$ .

$1 + 2 \tan^{2} (x) + \frac{\frac{\sin (x) \sin^{3} (x)}{\cos^{3} (x)}}{\cos (x)} + \frac{- \frac{1}{\cos^{3} (x)}}{\cos (x)} = \frac{0}{\cos (x)}$

Step 25

Multiply $\sin (x)$ by $\sin^{3} (x)$ by adding the exponents.

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Step 25.1

Multiply $\sin (x)$ by $\sin^{3} (x)$ .

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Step 25.1.1

Raise $\sin (x)$ to the power of $1$ .

$1 + 2 \tan^{2} (x) + \frac{\frac{\sin (x) \sin^{3} (x)}{\cos^{3} (x)}}{\cos (x)} + \frac{- \frac{1}{\cos^{3} (x)}}{\cos (x)} = \frac{0}{\cos (x)}$

Step 25.1.2

Use the power rule $a^{m} a^{n} = a^{m + n}$ to combine exponents.

$1 + 2 \tan^{2} (x) + \frac{\frac{{\sin (x)}^{1 + 3}}{\cos^{3} (x)}}{\cos (x)} + \frac{- \frac{1}{\cos^{3} (x)}}{\cos (x)} = \frac{0}{\cos (x)}$

Step 25.2

Add $1$ and $3$ .

$1 + 2 \tan^{2} (x) + \frac{\frac{\sin^{4} (x)}{\cos^{3} (x)}}{\cos (x)} + \frac{- \frac{1}{\cos^{3} (x)}}{\cos (x)} = \frac{0}{\cos (x)}$

Step 26

Multiply the numerator by the reciprocal of the denominator.

$1 + 2 \tan^{2} (x) + \frac{\sin^{4} (x)}{\cos^{3} (x)} \cdot \frac{1}{\cos (x)} + \frac{- \frac{1}{\cos^{3} (x)}}{\cos (x)} = \frac{0}{\cos (x)}$

Step 27

Combine.

$1 + 2 \tan^{2} (x) + \frac{\sin^{4} (x) \cdot 1}{\cos^{3} (x) \cos (x)} + \frac{- \frac{1}{\cos^{3} (x)}}{\cos (x)} = \frac{0}{\cos (x)}$

Step 28

Multiply $\cos^{3} (x)$ by $\cos (x)$ by adding the exponents.

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Step 28.1

Multiply $\cos^{3} (x)$ by $\cos (x)$ .

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Step 28.1.1

Raise $\cos (x)$ to the power of $1$ .

$1 + 2 \tan^{2} (x) + \frac{\sin^{4} (x) \cdot 1}{\cos^{3} (x) \cos (x)} + \frac{- \frac{1}{\cos^{3} (x)}}{\cos (x)} = \frac{0}{\cos (x)}$

Step 28.1.2

Use the power rule $a^{m} a^{n} = a^{m + n}$ to combine exponents.

$1 + 2 \tan^{2} (x) + \frac{\sin^{4} (x) \cdot 1}{{\cos (x)}^{3 + 1}} + \frac{- \frac{1}{\cos^{3} (x)}}{\cos (x)} = \frac{0}{\cos (x)}$

Step 28.2

Add $3$ and $1$ .

$1 + 2 \tan^{2} (x) + \frac{\sin^{4} (x) \cdot 1}{\cos^{4} (x)} + \frac{- \frac{1}{\cos^{3} (x)}}{\cos (x)} = \frac{0}{\cos (x)}$

Step 29

Multiply $\sin^{4} (x)$ by $1$ .

$1 + 2 \tan^{2} (x) + \frac{\sin^{4} (x)}{\cos^{4} (x)} + \frac{- \frac{1}{\cos^{3} (x)}}{\cos (x)} = \frac{0}{\cos (x)}$

Step 30

Convert from $\frac{\sin^{4} (x)}{\cos^{4} (x)}$ to $\tan^{4} (x)$ .

$1 + 2 \tan^{2} (x) + \tan^{4} (x) + \frac{- \frac{1}{\cos^{3} (x)}}{\cos (x)} = \frac{0}{\cos (x)}$

Step 31

Multiply the numerator by the reciprocal of the denominator.

$1 + 2 \tan^{2} (x) + \tan^{4} (x) - \frac{1}{\cos^{3} (x)} \cdot \frac{1}{\cos (x)} = \frac{0}{\cos (x)}$

Step 32

Convert from $\frac{1}{\cos (x)}$ to $\sec (x)$ .

$1 + 2 \tan^{2} (x) + \tan^{4} (x) - \frac{1}{\cos^{3} (x)} \cdot \sec (x) = \frac{0}{\cos (x)}$

Step 33

Combine $\sec (x)$ and $\frac{1}{\cos^{3} (x)}$ .

$1 + 2 \tan^{2} (x) + \tan^{4} (x) - \frac{\sec (x)}{\cos^{3} (x)} = \frac{0}{\cos (x)}$

Step 34

Factor $\cos (x)$ out of $\cos^{3} (x)$ .

$1 + 2 \tan^{2} (x) + \tan^{4} (x) - \frac{\sec (x)}{\cos (x) \cos^{2} (x)} = \frac{0}{\cos (x)}$

Step 35

Separate fractions.

$1 + 2 \tan^{2} (x) + \tan^{4} (x) - (\frac{1}{\cos^{2} (x)} \cdot \frac{\sec (x)}{\cos (x)}) = \frac{0}{\cos (x)}$

Step 36

Rewrite $\sec (x)$ in terms of sines and cosines.

$1 + 2 \tan^{2} (x) + \tan^{4} (x) - (\frac{1}{\cos^{2} (x)} \cdot \frac{\frac{1}{\cos (x)}}{\cos (x)}) = \frac{0}{\cos (x)}$

Step 37

Rewrite $\frac{\frac{1}{\cos (x)}}{\cos (x)}$ as a product.

$1 + 2 \tan^{2} (x) + \tan^{4} (x) - (\frac{1}{\cos^{2} (x)} \cdot (\frac{1}{\cos (x)} \cdot \frac{1}{\cos (x)})) = \frac{0}{\cos (x)}$

Step 38

Simplify.

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Step 38.1

Convert from $\frac{1}{\cos (x)}$ to $\sec (x)$ .

$1 + 2 \tan^{2} (x) + \tan^{4} (x) - (\frac{1}{\cos^{2} (x)} \cdot (\sec (x) (\frac{1}{\cos (x)}))) = \frac{0}{\cos (x)}$

Step 38.2

Convert from $\frac{1}{\cos (x)}$ to $\sec (x)$ .

$1 + 2 \tan^{2} (x) + \tan^{4} (x) - (\frac{1}{\cos^{2} (x)} \cdot (\sec (x) \sec (x))) = \frac{0}{\cos (x)}$

Step 38.3

Raise $\sec (x)$ to the power of $1$ .

$1 + 2 \tan^{2} (x) + \tan^{4} (x) - (\frac{1}{\cos^{2} (x)} \cdot (\sec (x) \sec (x))) = \frac{0}{\cos (x)}$

Step 38.4

Raise $\sec (x)$ to the power of $1$ .

$1 + 2 \tan^{2} (x) + \tan^{4} (x) - (\frac{1}{\cos^{2} (x)} \cdot (\sec (x) \sec (x))) = \frac{0}{\cos (x)}$

Step 38.5

Use the power rule $a^{m} a^{n} = a^{m + n}$ to combine exponents.

$1 + 2 \tan^{2} (x) + \tan^{4} (x) - (\frac{1}{\cos^{2} (x)} \cdot {\sec (x)}^{1 + 1}) = \frac{0}{\cos (x)}$

Step 38.6

Add $1$ and $1$ .

$1 + 2 \tan^{2} (x) + \tan^{4} (x) - (\frac{1}{\cos^{2} (x)} \cdot \sec^{2} (x)) = \frac{0}{\cos (x)}$

Step 39

Rewrite $1$ as $1^{2}$ .

$1 + 2 \tan^{2} (x) + \tan^{4} (x) - (\frac{1^{2}}{\cos^{2} (x)} \cdot \sec^{2} (x)) = \frac{0}{\cos (x)}$

Step 40

Rewrite $\frac{1^{2}}{\cos^{2} (x)}$ as ${(\frac{1}{\cos (x)})}^{2}$ .

$1 + 2 \tan^{2} (x) + \tan^{4} (x) - ({(\frac{1}{\cos (x)})}^{2} \sec^{2} (x)) = \frac{0}{\cos (x)}$

Step 41

Convert from $\frac{1}{\cos (x)}$ to $\sec (x)$ .

$1 + 2 \tan^{2} (x) + \tan^{4} (x) - (\sec^{2} (x) \sec^{2} (x)) = \frac{0}{\cos (x)}$

Step 42

Multiply $\sec^{2} (x)$ by $\sec^{2} (x)$ by adding the exponents.

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Step 42.1

Use the power rule $a^{m} a^{n} = a^{m + n}$ to combine exponents.

$1 + 2 \tan^{2} (x) + \tan^{4} (x) - {\sec (x)}^{2 + 2} = \frac{0}{\cos (x)}$

Step 42.2

Add $2$ and $2$ .

$1 + 2 \tan^{2} (x) + \tan^{4} (x) - \sec^{4} (x) = \frac{0}{\cos (x)}$

Step 43

Separate fractions.

$1 + 2 \tan^{2} (x) + \tan^{4} (x) - \sec^{4} (x) = \frac{0}{1} \cdot \frac{1}{\cos (x)}$

Step 44

Convert from $\frac{1}{\cos (x)}$ to $\sec (x)$ .

$1 + 2 \tan^{2} (x) + \tan^{4} (x) - \sec^{4} (x) = \frac{0}{1} \cdot \sec (x)$

Step 45

Divide $0$ by $1$ .

$1 + 2 \tan^{2} (x) + \tan^{4} (x) - \sec^{4} (x) = 0 \sec (x)$

Step 46

Multiply $0$ by $\sec (x)$ .

$1 + 2 \tan^{2} (x) + \tan^{4} (x) - \sec^{4} (x) = 0$

Step 47

Replace the $2 \tan^{2} (x)$ with $2 (\sec^{2} (x) - 1)$ based on the $\tan^{2} (x) + 1 = \sec^{2} (x)$ identity.

$1 + 2 (\sec^{2} (x) - 1) + \tan^{4} (x) - \sec^{4} (x) = 0$

Step 48

Simplify each term.

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Step 48.1

Apply the distributive property.

$1 + 2 \sec^{2} (x) + 2 \cdot - 1 + \tan^{4} (x) - \sec^{4} (x) = 0$

Step 48.2

Multiply $2$ by $- 1$ .

$1 + 2 \sec^{2} (x) - 2 + \tan^{4} (x) - \sec^{4} (x) = 0$

Step 49

Subtract $2$ from $1$ .

$2 \sec^{2} (x) - 1 + \tan^{4} (x) - \sec^{4} (x) = 0$

Step 50

Reorder the polynomial.

$\tan^{4} (x) - \sec^{4} (x) + 2 \sec^{2} (x) - 1 = 0$

Step 51

Multiply both sides by $\cos (x)$ .

$(1 + 2 \tan^{2} (x) + \tan^{4} (x) - \sec^{4} (x)) \cos (x) = \frac{0}{\cos (x)} \cos (x)$

Step 52

Simplify.

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Step 52.1

Simplify the left side.

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Step 52.1.1

Simplify $(1 + 2 \tan^{2} (x) + \tan^{4} (x) - \sec^{4} (x)) \cos (x)$ .

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Step 52.1.1.1

Simplify each term.

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Step 52.1.1.1.1

Rewrite $\tan (x)$ in terms of sines and cosines.

$(1 + 2 {(\frac{\sin (x)}{\cos (x)})}^{2} + \tan^{4} (x) - \sec^{4} (x)) \cos (x) = \frac{0}{\cos (x)} \cos (x)$

Step 52.1.1.1.2

Apply the product rule to $\frac{\sin (x)}{\cos (x)}$ .

$(1 + 2 \frac{\sin^{2} (x)}{\cos^{2} (x)} + \tan^{4} (x) - \sec^{4} (x)) \cos (x) = \frac{0}{\cos (x)} \cos (x)$

Step 52.1.1.1.3

Combine $2$ and $\frac{\sin^{2} (x)}{\cos^{2} (x)}$ .

$(1 + \frac{2 \sin^{2} (x)}{\cos^{2} (x)} + \tan^{4} (x) - \sec^{4} (x)) \cos (x) = \frac{0}{\cos (x)} \cos (x)$

Step 52.1.1.1.4

Rewrite $\tan (x)$ in terms of sines and cosines.

$(1 + \frac{2 \sin^{2} (x)}{\cos^{2} (x)} + {(\frac{\sin (x)}{\cos (x)})}^{4} - \sec^{4} (x)) \cos (x) = \frac{0}{\cos (x)} \cos (x)$

Step 52.1.1.1.5

Apply the product rule to $\frac{\sin (x)}{\cos (x)}$ .

$(1 + \frac{2 \sin^{2} (x)}{\cos^{2} (x)} + \frac{\sin^{4} (x)}{\cos^{4} (x)} - \sec^{4} (x)) \cos (x) = \frac{0}{\cos (x)} \cos (x)$

Step 52.1.1.1.6

Rewrite $\sec (x)$ in terms of sines and cosines.

$(1 + \frac{2 \sin^{2} (x)}{\cos^{2} (x)} + \frac{\sin^{4} (x)}{\cos^{4} (x)} - {(\frac{1}{\cos (x)})}^{4}) \cos (x) = \frac{0}{\cos (x)} \cos (x)$

Step 52.1.1.1.7

Apply the product rule to $\frac{1}{\cos (x)}$ .

$(1 + \frac{2 \sin^{2} (x)}{\cos^{2} (x)} + \frac{\sin^{4} (x)}{\cos^{4} (x)} - \frac{1^{4}}{\cos^{4} (x)}) \cos (x) = \frac{0}{\cos (x)} \cos (x)$

Step 52.1.1.1.8

One to any power is one.

$(1 + \frac{2 \sin^{2} (x)}{\cos^{2} (x)} + \frac{\sin^{4} (x)}{\cos^{4} (x)} - \frac{1}{\cos^{4} (x)}) \cos (x) = \frac{0}{\cos (x)} \cos (x)$

Step 52.1.1.2

Apply the distributive property.

$1 \cos (x) + \frac{2 \sin^{2} (x)}{\cos^{2} (x)} \cos (x) + \frac{\sin^{4} (x)}{\cos^{4} (x)} \cos (x) - \frac{1}{\cos^{4} (x)} \cos (x) = \frac{0}{\cos (x)} \cos (x)$

Step 52.1.1.3

Simplify.

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Step 52.1.1.3.1

Multiply $\cos (x)$ by $1$ .

$\cos (x) + \frac{2 \sin^{2} (x)}{\cos^{2} (x)} \cos (x) + \frac{\sin^{4} (x)}{\cos^{4} (x)} \cos (x) - \frac{1}{\cos^{4} (x)} \cos (x) = \frac{0}{\cos (x)} \cos (x)$

Step 52.1.1.3.2

Cancel the common factor of $\cos (x)$ .

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Step 52.1.1.3.2.1

Factor $\cos (x)$ out of $\cos^{2} (x)$ .

$\cos (x) + \frac{2 \sin^{2} (x)}{\cos (x) \cos (x)} \cos (x) + \frac{\sin^{4} (x)}{\cos^{4} (x)} \cos (x) - \frac{1}{\cos^{4} (x)} \cos (x) = \frac{0}{\cos (x)} \cos (x)$

Step 52.1.1.3.2.2

Cancel the common factor.

$\cos (x) + \frac{2 \sin^{2} (x)}{\cos (x) \cos (x)} \cos (x) + \frac{\sin^{4} (x)}{\cos^{4} (x)} \cos (x) - \frac{1}{\cos^{4} (x)} \cos (x) = \frac{0}{\cos (x)} \cos (x)$

Step 52.1.1.3.2.3

Rewrite the expression.

$\cos (x) + \frac{2 \sin^{2} (x)}{\cos (x)} + \frac{\sin^{4} (x)}{\cos^{4} (x)} \cos (x) - \frac{1}{\cos^{4} (x)} \cos (x) = \frac{0}{\cos (x)} \cos (x)$

Step 52.1.1.3.3

Cancel the common factor of $\cos (x)$ .

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Step 52.1.1.3.3.1

Factor $\cos (x)$ out of $\cos^{4} (x)$ .

$\cos (x) + \frac{2 \sin^{2} (x)}{\cos (x)} + \frac{\sin^{4} (x)}{\cos (x) \cos^{3} (x)} \cos (x) - \frac{1}{\cos^{4} (x)} \cos (x) = \frac{0}{\cos (x)} \cos (x)$

Step 52.1.1.3.3.2

Cancel the common factor.

$\cos (x) + \frac{2 \sin^{2} (x)}{\cos (x)} + \frac{\sin^{4} (x)}{\cos (x) \cos^{3} (x)} \cos (x) - \frac{1}{\cos^{4} (x)} \cos (x) = \frac{0}{\cos (x)} \cos (x)$

Step 52.1.1.3.3.3

Rewrite the expression.

$\cos (x) + \frac{2 \sin^{2} (x)}{\cos (x)} + \frac{\sin^{4} (x)}{\cos^{3} (x)} - \frac{1}{\cos^{4} (x)} \cos (x) = \frac{0}{\cos (x)} \cos (x)$

Step 52.1.1.3.4

Cancel the common factor of $\cos (x)$ .

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Step 52.1.1.3.4.1

Move the leading negative in $- \frac{1}{\cos^{4} (x)}$ into the numerator.

$\cos (x) + \frac{2 \sin^{2} (x)}{\cos (x)} + \frac{\sin^{4} (x)}{\cos^{3} (x)} + \frac{- 1}{\cos^{4} (x)} \cos (x) = \frac{0}{\cos (x)} \cos (x)$

Step 52.1.1.3.4.2

Factor $\cos (x)$ out of $\cos^{4} (x)$ .

$\cos (x) + \frac{2 \sin^{2} (x)}{\cos (x)} + \frac{\sin^{4} (x)}{\cos^{3} (x)} + \frac{- 1}{\cos (x) \cos^{3} (x)} \cos (x) = \frac{0}{\cos (x)} \cos (x)$

Step 52.1.1.3.4.3

Cancel the common factor.

$\cos (x) + \frac{2 \sin^{2} (x)}{\cos (x)} + \frac{\sin^{4} (x)}{\cos^{3} (x)} + \frac{- 1}{\cos (x) \cos^{3} (x)} \cos (x) = \frac{0}{\cos (x)} \cos (x)$

Step 52.1.1.3.4.4

Rewrite the expression.

$\cos (x) + \frac{2 \sin^{2} (x)}{\cos (x)} + \frac{\sin^{4} (x)}{\cos^{3} (x)} + \frac{- 1}{\cos^{3} (x)} = \frac{0}{\cos (x)} \cos (x)$

Step 52.1.1.4

Move the negative in front of the fraction.

$\cos (x) + \frac{2 \sin^{2} (x)}{\cos (x)} + \frac{\sin^{4} (x)}{\cos^{3} (x)} - \frac{1}{\cos^{3} (x)} = \frac{0}{\cos (x)} \cos (x)$

Step 52.1.1.5

Simplify each term.

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Step 52.1.1.5.1

Factor $\sin (x)$ out of $\sin^{2} (x)$ .

$\cos (x) + \frac{2 (\sin (x) \sin (x))}{\cos (x)} + \frac{\sin^{4} (x)}{\cos^{3} (x)} - \frac{1}{\cos^{3} (x)} = \frac{0}{\cos (x)} \cos (x)$

Step 52.1.1.5.2

Separate fractions.

$\cos (x) + \frac{2 (\sin (x))}{1} \cdot \frac{\sin (x)}{\cos (x)} + \frac{\sin^{4} (x)}{\cos^{3} (x)} - \frac{1}{\cos^{3} (x)} = \frac{0}{\cos (x)} \cos (x)$

Step 52.1.1.5.3

Convert from $\frac{\sin (x)}{\cos (x)}$ to $\tan (x)$ .

$\cos (x) + \frac{2 (\sin (x))}{1} \tan (x) + \frac{\sin^{4} (x)}{\cos^{3} (x)} - \frac{1}{\cos^{3} (x)} = \frac{0}{\cos (x)} \cos (x)$

Step 52.1.1.5.4

Divide $2 (\sin (x))$ by $1$ .

$\cos (x) + 2 (\sin (x)) \tan (x) + \frac{\sin^{4} (x)}{\cos^{3} (x)} - \frac{1}{\cos^{3} (x)} = \frac{0}{\cos (x)} \cos (x)$

Step 52.1.1.5.5

Factor $\sin^{3} (x)$ out of $\sin^{4} (x)$ .

$\cos (x) + 2 \sin (x) \tan (x) + \frac{\sin^{3} (x) \sin (x)}{\cos^{3} (x)} - \frac{1}{\cos^{3} (x)} = \frac{0}{\cos (x)} \cos (x)$

Step 52.1.1.5.6

Multiply by $1$ .

$\cos (x) + 2 \sin (x) \tan (x) + \frac{\sin^{3} (x) \sin (x)}{\cos^{3} (x) \cdot 1} - \frac{1}{\cos^{3} (x)} = \frac{0}{\cos (x)} \cos (x)$

Step 52.1.1.5.7

Separate fractions.

$\cos (x) + 2 \sin (x) \tan (x) + \frac{\sin (x)}{1} \cdot \frac{\sin^{3} (x)}{\cos^{3} (x)} - \frac{1}{\cos^{3} (x)} = \frac{0}{\cos (x)} \cos (x)$

Step 52.1.1.5.8

Convert from $\frac{\sin^{3} (x)}{\cos^{3} (x)}$ to $\tan^{3} (x)$ .

$\cos (x) + 2 \sin (x) \tan (x) + \frac{\sin (x)}{1} \tan^{3} (x) - \frac{1}{\cos^{3} (x)} = \frac{0}{\cos (x)} \cos (x)$

Step 52.1.1.5.9

Divide $\sin (x)$ by $1$ .

$\cos (x) + 2 \sin (x) \tan (x) + \sin (x) \tan^{3} (x) - \frac{1}{\cos^{3} (x)} = \frac{0}{\cos (x)} \cos (x)$

Step 52.2

Simplify the right side.

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Step 52.2.1

Cancel the common factor of $\cos (x)$ .

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Step 52.2.1.1

Cancel the common factor.

$\cos (x) + 2 \sin (x) \tan (x) + \sin (x) \tan^{3} (x) - \frac{1}{\cos^{3} (x)} = \frac{0}{\cos (x)} \cos (x)$

Step 52.2.1.2

Rewrite the expression.

$\cos (x) + 2 \sin (x) \tan (x) + \sin (x) \tan^{3} (x) - \frac{1}{\cos^{3} (x)} = 0$

Step 53

Solve for $x$ .

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Step 53.1

Divide each term in the equation by $\cos (x)$ .

$\frac{\cos (x)}{\cos (x)} + \frac{2 \sin (x) \tan (x)}{\cos (x)} + \frac{\sin (x) \tan^{3} (x)}{\cos (x)} + \frac{- \frac{1}{\cos^{3} (x)}}{\cos (x)} = \frac{0}{\cos (x)}$

Step 53.2

Cancel the common factor of $\cos (x)$ .

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Step 53.2.1

Cancel the common factor.

$\frac{\cos (x)}{\cos (x)} + \frac{2 \sin (x) \tan (x)}{\cos (x)} + \frac{\sin (x) \tan^{3} (x)}{\cos (x)} + \frac{- \frac{1}{\cos^{3} (x)}}{\cos (x)} = \frac{0}{\cos (x)}$

Step 53.2.2

Rewrite the expression.

$1 + \frac{2 \sin (x) \tan (x)}{\cos (x)} + \frac{\sin (x) \tan^{3} (x)}{\cos (x)} + \frac{- \frac{1}{\cos^{3} (x)}}{\cos (x)} = \frac{0}{\cos (x)}$

Step 53.3

Simplify the numerator.

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Step 53.3.1

Rewrite $\tan (x)$ in terms of sines and cosines.

$1 + \frac{2 \sin (x) (\frac{\sin (x)}{\cos (x)})}{\cos (x)} + \frac{\sin (x) \tan^{3} (x)}{\cos (x)} + \frac{- \frac{1}{\cos^{3} (x)}}{\cos (x)} = \frac{0}{\cos (x)}$

Step 53.3.2

Combine exponents.

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Step 53.3.2.1

Combine $\frac{\sin (x)}{\cos (x)}$ and $2$ .

$1 + \frac{\frac{\sin (x) \cdot 2}{\cos (x)} \cdot \sin (x)}{\cos (x)} + \frac{\sin (x) \tan^{3} (x)}{\cos (x)} + \frac{- \frac{1}{\cos^{3} (x)}}{\cos (x)} = \frac{0}{\cos (x)}$

Step 53.3.2.2

Combine $\frac{\sin (x) \cdot 2}{\cos (x)}$ and $\sin (x)$ .

$1 + \frac{\frac{\sin (x) \cdot (2 \sin (x))}{\cos (x)}}{\cos (x)} + \frac{\sin (x) \tan^{3} (x)}{\cos (x)} + \frac{- \frac{1}{\cos^{3} (x)}}{\cos (x)} = \frac{0}{\cos (x)}$

Step 53.3.2.3

Raise $\sin (x)$ to the power of $1$ .

$1 + \frac{\frac{2 (\sin (x) \sin (x))}{\cos (x)}}{\cos (x)} + \frac{\sin (x) \tan^{3} (x)}{\cos (x)} + \frac{- \frac{1}{\cos^{3} (x)}}{\cos (x)} = \frac{0}{\cos (x)}$

Step 53.3.2.4

Raise $\sin (x)$ to the power of $1$ .

$1 + \frac{\frac{2 (\sin (x) \sin (x))}{\cos (x)}}{\cos (x)} + \frac{\sin (x) \tan^{3} (x)}{\cos (x)} + \frac{- \frac{1}{\cos^{3} (x)}}{\cos (x)} = \frac{0}{\cos (x)}$

Step 53.3.2.5

Use the power rule $a^{m} a^{n} = a^{m + n}$ to combine exponents.

$1 + \frac{\frac{2 {\sin (x)}^{1 + 1}}{\cos (x)}}{\cos (x)} + \frac{\sin (x) \tan^{3} (x)}{\cos (x)} + \frac{- \frac{1}{\cos^{3} (x)}}{\cos (x)} = \frac{0}{\cos (x)}$

Step 53.3.2.6

Add $1$ and $1$ .

$1 + \frac{\frac{2 \sin^{2} (x)}{\cos (x)}}{\cos (x)} + \frac{\sin (x) \tan^{3} (x)}{\cos (x)} + \frac{- \frac{1}{\cos^{3} (x)}}{\cos (x)} = \frac{0}{\cos (x)}$

Step 53.4

Multiply the numerator by the reciprocal of the denominator.

$1 + \frac{2 \sin^{2} (x)}{\cos (x)} \cdot \frac{1}{\cos (x)} + \frac{\sin (x) \tan^{3} (x)}{\cos (x)} + \frac{- \frac{1}{\cos^{3} (x)}}{\cos (x)} = \frac{0}{\cos (x)}$

Step 53.5

Combine fractions.

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Step 53.5.1

Combine.

$1 + \frac{2 \sin^{2} (x) \cdot 1}{\cos (x) \cos (x)} + \frac{\sin (x) \tan^{3} (x)}{\cos (x)} + \frac{- \frac{1}{\cos^{3} (x)}}{\cos (x)} = \frac{0}{\cos (x)}$

Step 53.5.2

Multiply $2$ by $1$ .

$1 + \frac{2 \sin^{2} (x)}{\cos (x) \cos (x)} + \frac{\sin (x) \tan^{3} (x)}{\cos (x)} + \frac{- \frac{1}{\cos^{3} (x)}}{\cos (x)} = \frac{0}{\cos (x)}$

Step 53.6

Simplify the denominator.

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Step 53.6.1

Use the power rule $a^{m} a^{n} = a^{m + n}$ to combine exponents.

$1 + \frac{2 \sin^{2} (x)}{{\cos (x)}^{1 + 1}} + \frac{\sin (x) \tan^{3} (x)}{\cos (x)} + \frac{- \frac{1}{\cos^{3} (x)}}{\cos (x)} = \frac{0}{\cos (x)}$

Step 53.6.2

Add $1$ and $1$ .

$1 + \frac{2 \sin^{2} (x)}{\cos^{2} (x)} + \frac{\sin (x) \tan^{3} (x)}{\cos (x)} + \frac{- \frac{1}{\cos^{3} (x)}}{\cos (x)} = \frac{0}{\cos (x)}$

Step 53.7

Multiply by $1$ .

$1 + \frac{2 (\sin^{2} (x) \cdot 1)}{\cos^{2} (x)} + \frac{\sin (x) \tan^{3} (x)}{\cos (x)} + \frac{- \frac{1}{\cos^{3} (x)}}{\cos (x)} = \frac{0}{\cos (x)}$

Step 53.8

Multiply by $1$ .

$1 + \frac{2 (\sin^{2} (x) \cdot 1)}{\cos^{2} (x) \cdot 1} + \frac{\sin (x) \tan^{3} (x)}{\cos (x)} + \frac{- \frac{1}{\cos^{3} (x)}}{\cos (x)} = \frac{0}{\cos (x)}$

Step 53.9

Separate fractions.

$1 + \frac{2 \cdot (1)}{1} \cdot \frac{\sin^{2} (x)}{\cos^{2} (x)} + \frac{\sin (x) \tan^{3} (x)}{\cos (x)} + \frac{- \frac{1}{\cos^{3} (x)}}{\cos (x)} = \frac{0}{\cos (x)}$

Step 53.10

Convert from $\frac{\sin^{2} (x)}{\cos^{2} (x)}$ to $\tan^{2} (x)$ .

$1 + \frac{2 \cdot (1)}{1} \cdot \tan^{2} (x) + \frac{\sin (x) \tan^{3} (x)}{\cos (x)} + \frac{- \frac{1}{\cos^{3} (x)}}{\cos (x)} = \frac{0}{\cos (x)}$

Step 53.11

Multiply $2$ by $1$ .

$1 + \frac{2}{1} \cdot \tan^{2} (x) + \frac{\sin (x) \tan^{3} (x)}{\cos (x)} + \frac{- \frac{1}{\cos^{3} (x)}}{\cos (x)} = \frac{0}{\cos (x)}$

Step 53.12

Divide $2$ by $1$ .

$1 + 2 \tan^{2} (x) + \frac{\sin (x) \tan^{3} (x)}{\cos (x)} + \frac{- \frac{1}{\cos^{3} (x)}}{\cos (x)} = \frac{0}{\cos (x)}$

Step 53.13

Simplify the numerator.

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Step 53.13.1

Rewrite $\tan (x)$ in terms of sines and cosines.

$1 + 2 \tan^{2} (x) + \frac{\sin (x) {(\frac{\sin (x)}{\cos (x)})}^{3}}{\cos (x)} + \frac{- \frac{1}{\cos^{3} (x)}}{\cos (x)} = \frac{0}{\cos (x)}$

Step 53.13.2

Apply the product rule to $\frac{\sin (x)}{\cos (x)}$ .

$1 + 2 \tan^{2} (x) + \frac{\sin (x) (\frac{\sin^{3} (x)}{\cos^{3} (x)})}{\cos (x)} + \frac{- \frac{1}{\cos^{3} (x)}}{\cos (x)} = \frac{0}{\cos (x)}$

Step 53.14

Combine $\sin (x)$ and $\frac{\sin^{3} (x)}{\cos^{3} (x)}$ .

$1 + 2 \tan^{2} (x) + \frac{\frac{\sin (x) \sin^{3} (x)}{\cos^{3} (x)}}{\cos (x)} + \frac{- \frac{1}{\cos^{3} (x)}}{\cos (x)} = \frac{0}{\cos (x)}$

Step 53.15

Multiply $\sin (x)$ by $\sin^{3} (x)$ by adding the exponents.

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Step 53.15.1

Multiply $\sin (x)$ by $\sin^{3} (x)$ .

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Step 53.15.1.1

Raise $\sin (x)$ to the power of $1$ .

$1 + 2 \tan^{2} (x) + \frac{\frac{\sin (x) \sin^{3} (x)}{\cos^{3} (x)}}{\cos (x)} + \frac{- \frac{1}{\cos^{3} (x)}}{\cos (x)} = \frac{0}{\cos (x)}$

Step 53.15.1.2

Use the power rule $a^{m} a^{n} = a^{m + n}$ to combine exponents.

$1 + 2 \tan^{2} (x) + \frac{\frac{{\sin (x)}^{1 + 3}}{\cos^{3} (x)}}{\cos (x)} + \frac{- \frac{1}{\cos^{3} (x)}}{\cos (x)} = \frac{0}{\cos (x)}$

Step 53.15.2

Add $1$ and $3$ .

$1 + 2 \tan^{2} (x) + \frac{\frac{\sin^{4} (x)}{\cos^{3} (x)}}{\cos (x)} + \frac{- \frac{1}{\cos^{3} (x)}}{\cos (x)} = \frac{0}{\cos (x)}$

Step 53.16

Multiply the numerator by the reciprocal of the denominator.

$1 + 2 \tan^{2} (x) + \frac{\sin^{4} (x)}{\cos^{3} (x)} \cdot \frac{1}{\cos (x)} + \frac{- \frac{1}{\cos^{3} (x)}}{\cos (x)} = \frac{0}{\cos (x)}$

Step 53.17

Combine.

$1 + 2 \tan^{2} (x) + \frac{\sin^{4} (x) \cdot 1}{\cos^{3} (x) \cos (x)} + \frac{- \frac{1}{\cos^{3} (x)}}{\cos (x)} = \frac{0}{\cos (x)}$

Step 53.18

Multiply $\cos^{3} (x)$ by $\cos (x)$ by adding the exponents.

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Step 53.18.1

Multiply $\cos^{3} (x)$ by $\cos (x)$ .

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Step 53.18.1.1

Raise $\cos (x)$ to the power of $1$ .

$1 + 2 \tan^{2} (x) + \frac{\sin^{4} (x) \cdot 1}{\cos^{3} (x) \cos (x)} + \frac{- \frac{1}{\cos^{3} (x)}}{\cos (x)} = \frac{0}{\cos (x)}$

Step 53.18.1.2

Use the power rule $a^{m} a^{n} = a^{m + n}$ to combine exponents.

$1 + 2 \tan^{2} (x) + \frac{\sin^{4} (x) \cdot 1}{{\cos (x)}^{3 + 1}} + \frac{- \frac{1}{\cos^{3} (x)}}{\cos (x)} = \frac{0}{\cos (x)}$

Step 53.18.2

Add $3$ and $1$ .

$1 + 2 \tan^{2} (x) + \frac{\sin^{4} (x) \cdot 1}{\cos^{4} (x)} + \frac{- \frac{1}{\cos^{3} (x)}}{\cos (x)} = \frac{0}{\cos (x)}$

Step 53.19

Multiply $\sin^{4} (x)$ by $1$ .

$1 + 2 \tan^{2} (x) + \frac{\sin^{4} (x)}{\cos^{4} (x)} + \frac{- \frac{1}{\cos^{3} (x)}}{\cos (x)} = \frac{0}{\cos (x)}$

Step 53.20

Convert from $\frac{\sin^{4} (x)}{\cos^{4} (x)}$ to $\tan^{4} (x)$ .

$1 + 2 \tan^{2} (x) + \tan^{4} (x) + \frac{- \frac{1}{\cos^{3} (x)}}{\cos (x)} = \frac{0}{\cos (x)}$

Step 53.21

Multiply the numerator by the reciprocal of the denominator.

$1 + 2 \tan^{2} (x) + \tan^{4} (x) - \frac{1}{\cos^{3} (x)} \cdot \frac{1}{\cos (x)} = \frac{0}{\cos (x)}$

Step 53.22

Convert from $\frac{1}{\cos (x)}$ to $\sec (x)$ .

$1 + 2 \tan^{2} (x) + \tan^{4} (x) - \frac{1}{\cos^{3} (x)} \cdot \sec (x) = \frac{0}{\cos (x)}$

Step 53.23

Combine $\sec (x)$ and $\frac{1}{\cos^{3} (x)}$ .

$1 + 2 \tan^{2} (x) + \tan^{4} (x) - \frac{\sec (x)}{\cos^{3} (x)} = \frac{0}{\cos (x)}$

Step 53.24

Factor $\cos (x)$ out of $\cos^{3} (x)$ .

$1 + 2 \tan^{2} (x) + \tan^{4} (x) - \frac{\sec (x)}{\cos (x) \cos^{2} (x)} = \frac{0}{\cos (x)}$

Step 53.25

Separate fractions.

$1 + 2 \tan^{2} (x) + \tan^{4} (x) - (\frac{1}{\cos^{2} (x)} \cdot \frac{\sec (x)}{\cos (x)}) = \frac{0}{\cos (x)}$

Step 53.26

Rewrite $\sec (x)$ in terms of sines and cosines.

$1 + 2 \tan^{2} (x) + \tan^{4} (x) - (\frac{1}{\cos^{2} (x)} \cdot \frac{\frac{1}{\cos (x)}}{\cos (x)}) = \frac{0}{\cos (x)}$

Step 53.27

Rewrite $\frac{\frac{1}{\cos (x)}}{\cos (x)}$ as a product.

$1 + 2 \tan^{2} (x) + \tan^{4} (x) - (\frac{1}{\cos^{2} (x)} \cdot (\frac{1}{\cos (x)} \cdot \frac{1}{\cos (x)})) = \frac{0}{\cos (x)}$

Step 53.28

Simplify.

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Step 53.28.1

Convert from $\frac{1}{\cos (x)}$ to $\sec (x)$ .

$1 + 2 \tan^{2} (x) + \tan^{4} (x) - (\frac{1}{\cos^{2} (x)} \cdot (\sec (x) (\frac{1}{\cos (x)}))) = \frac{0}{\cos (x)}$

Step 53.28.2

Convert from $\frac{1}{\cos (x)}$ to $\sec (x)$ .

$1 + 2 \tan^{2} (x) + \tan^{4} (x) - (\frac{1}{\cos^{2} (x)} \cdot (\sec (x) \sec (x))) = \frac{0}{\cos (x)}$

Step 53.28.3

Raise $\sec (x)$ to the power of $1$ .

$1 + 2 \tan^{2} (x) + \tan^{4} (x) - (\frac{1}{\cos^{2} (x)} \cdot (\sec (x) \sec (x))) = \frac{0}{\cos (x)}$

Step 53.28.4

Raise $\sec (x)$ to the power of $1$ .

$1 + 2 \tan^{2} (x) + \tan^{4} (x) - (\frac{1}{\cos^{2} (x)} \cdot (\sec (x) \sec (x))) = \frac{0}{\cos (x)}$

Step 53.28.5

Use the power rule $a^{m} a^{n} = a^{m + n}$ to combine exponents.

$1 + 2 \tan^{2} (x) + \tan^{4} (x) - (\frac{1}{\cos^{2} (x)} \cdot {\sec (x)}^{1 + 1}) = \frac{0}{\cos (x)}$

Step 53.28.6

Add $1$ and $1$ .

$1 + 2 \tan^{2} (x) + \tan^{4} (x) - (\frac{1}{\cos^{2} (x)} \cdot \sec^{2} (x)) = \frac{0}{\cos (x)}$

Step 53.29

Rewrite $1$ as $1^{2}$ .

$1 + 2 \tan^{2} (x) + \tan^{4} (x) - (\frac{1^{2}}{\cos^{2} (x)} \cdot \sec^{2} (x)) = \frac{0}{\cos (x)}$

Step 53.30

Rewrite $\frac{1^{2}}{\cos^{2} (x)}$ as ${(\frac{1}{\cos (x)})}^{2}$ .

$1 + 2 \tan^{2} (x) + \tan^{4} (x) - ({(\frac{1}{\cos (x)})}^{2} \sec^{2} (x)) = \frac{0}{\cos (x)}$

Step 53.31

Convert from $\frac{1}{\cos (x)}$ to $\sec (x)$ .

$1 + 2 \tan^{2} (x) + \tan^{4} (x) - (\sec^{2} (x) \sec^{2} (x)) = \frac{0}{\cos (x)}$

Step 53.32

Multiply $\sec^{2} (x)$ by $\sec^{2} (x)$ by adding the exponents.

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Step 53.32.1

Use the power rule $a^{m} a^{n} = a^{m + n}$ to combine exponents.

$1 + 2 \tan^{2} (x) + \tan^{4} (x) - {\sec (x)}^{2 + 2} = \frac{0}{\cos (x)}$

Step 53.32.2

Add $2$ and $2$ .

$1 + 2 \tan^{2} (x) + \tan^{4} (x) - \sec^{4} (x) = \frac{0}{\cos (x)}$

Step 53.33

Separate fractions.

$1 + 2 \tan^{2} (x) + \tan^{4} (x) - \sec^{4} (x) = \frac{0}{1} \cdot \frac{1}{\cos (x)}$

Step 53.34

Convert from $\frac{1}{\cos (x)}$ to $\sec (x)$ .

$1 + 2 \tan^{2} (x) + \tan^{4} (x) - \sec^{4} (x) = \frac{0}{1} \cdot \sec (x)$

Step 53.35

Divide $0$ by $1$ .

$1 + 2 \tan^{2} (x) + \tan^{4} (x) - \sec^{4} (x) = 0 \sec (x)$

Step 53.36

Multiply $0$ by $\sec (x)$ .

$1 + 2 \tan^{2} (x) + \tan^{4} (x) - \sec^{4} (x) = 0$

Step 53.37

Replace the $2 \tan^{2} (x)$ with $2 (\sec^{2} (x) - 1)$ based on the $\tan^{2} (x) + 1 = \sec^{2} (x)$ identity.

$1 + 2 (\sec^{2} (x) - 1) + \tan^{4} (x) - \sec^{4} (x) = 0$

Step 53.38

Simplify each term.

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Step 53.38.1

Apply the distributive property.

$1 + 2 \sec^{2} (x) + 2 \cdot - 1 + \tan^{4} (x) - \sec^{4} (x) = 0$

Step 53.38.2

Multiply $2$ by $- 1$ .

$1 + 2 \sec^{2} (x) - 2 + \tan^{4} (x) - \sec^{4} (x) = 0$

Step 53.39

Subtract $2$ from $1$ .

$2 \sec^{2} (x) - 1 + \tan^{4} (x) - \sec^{4} (x) = 0$

Step 53.40

Reorder the polynomial.

$\tan^{4} (x) - \sec^{4} (x) + 2 \sec^{2} (x) - 1 = 0$

Step 53.41

Multiply both sides by $\cos (x)$ .

$(1 + 2 \tan^{2} (x) + \tan^{4} (x) - \sec^{4} (x)) \cos (x) = \frac{0}{\cos (x)} \cos (x)$

Step 53.42

Simplify.

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Step 53.42.1

Simplify the left side.

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Step 53.42.1.1

Simplify $(1 + 2 \tan^{2} (x) + \tan^{4} (x) - \sec^{4} (x)) \cos (x)$ .

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Step 53.42.1.1.1

Simplify each term.

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Step 53.42.1.1.1.1

Rewrite $\tan (x)$ in terms of sines and cosines.

$(1 + 2 {(\frac{\sin (x)}{\cos (x)})}^{2} + \tan^{4} (x) - \sec^{4} (x)) \cos (x) = \frac{0}{\cos (x)} \cos (x)$

Step 53.42.1.1.1.2

Apply the product rule to $\frac{\sin (x)}{\cos (x)}$ .

$(1 + 2 \frac{\sin^{2} (x)}{\cos^{2} (x)} + \tan^{4} (x) - \sec^{4} (x)) \cos (x) = \frac{0}{\cos (x)} \cos (x)$

Step 53.42.1.1.1.3

Combine $2$ and $\frac{\sin^{2} (x)}{\cos^{2} (x)}$ .

$(1 + \frac{2 \sin^{2} (x)}{\cos^{2} (x)} + \tan^{4} (x) - \sec^{4} (x)) \cos (x) = \frac{0}{\cos (x)} \cos (x)$

Step 53.42.1.1.1.4

Rewrite $\tan (x)$ in terms of sines and cosines.

$(1 + \frac{2 \sin^{2} (x)}{\cos^{2} (x)} + {(\frac{\sin (x)}{\cos (x)})}^{4} - \sec^{4} (x)) \cos (x) = \frac{0}{\cos (x)} \cos (x)$

Step 53.42.1.1.1.5

Apply the product rule to $\frac{\sin (x)}{\cos (x)}$ .

$(1 + \frac{2 \sin^{2} (x)}{\cos^{2} (x)} + \frac{\sin^{4} (x)}{\cos^{4} (x)} - \sec^{4} (x)) \cos (x) = \frac{0}{\cos (x)} \cos (x)$

Step 53.42.1.1.1.6

Rewrite $\sec (x)$ in terms of sines and cosines.

$(1 + \frac{2 \sin^{2} (x)}{\cos^{2} (x)} + \frac{\sin^{4} (x)}{\cos^{4} (x)} - {(\frac{1}{\cos (x)})}^{4}) \cos (x) = \frac{0}{\cos (x)} \cos (x)$

Step 53.42.1.1.1.7

Apply the product rule to $\frac{1}{\cos (x)}$ .

$(1 + \frac{2 \sin^{2} (x)}{\cos^{2} (x)} + \frac{\sin^{4} (x)}{\cos^{4} (x)} - \frac{1^{4}}{\cos^{4} (x)}) \cos (x) = \frac{0}{\cos (x)} \cos (x)$

Step 53.42.1.1.1.8

One to any power is one.

$(1 + \frac{2 \sin^{2} (x)}{\cos^{2} (x)} + \frac{\sin^{4} (x)}{\cos^{4} (x)} - \frac{1}{\cos^{4} (x)}) \cos (x) = \frac{0}{\cos (x)} \cos (x)$

Step 53.42.1.1.2

Apply the distributive property.

$1 \cos (x) + \frac{2 \sin^{2} (x)}{\cos^{2} (x)} \cos (x) + \frac{\sin^{4} (x)}{\cos^{4} (x)} \cos (x) - \frac{1}{\cos^{4} (x)} \cos (x) = \frac{0}{\cos (x)} \cos (x)$

Step 53.42.1.1.3

Simplify.

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Step 53.42.1.1.3.1

Multiply $\cos (x)$ by $1$ .

$\cos (x) + \frac{2 \sin^{2} (x)}{\cos^{2} (x)} \cos (x) + \frac{\sin^{4} (x)}{\cos^{4} (x)} \cos (x) - \frac{1}{\cos^{4} (x)} \cos (x) = \frac{0}{\cos (x)} \cos (x)$

Step 53.42.1.1.3.2

Cancel the common factor of $\cos (x)$ .

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Step 53.42.1.1.3.2.1

Factor $\cos (x)$ out of $\cos^{2} (x)$ .

$\cos (x) + \frac{2 \sin^{2} (x)}{\cos (x) \cos (x)} \cos (x) + \frac{\sin^{4} (x)}{\cos^{4} (x)} \cos (x) - \frac{1}{\cos^{4} (x)} \cos (x) = \frac{0}{\cos (x)} \cos (x)$

Step 53.42.1.1.3.2.2

Cancel the common factor.

$\cos (x) + \frac{2 \sin^{2} (x)}{\cos (x) \cos (x)} \cos (x) + \frac{\sin^{4} (x)}{\cos^{4} (x)} \cos (x) - \frac{1}{\cos^{4} (x)} \cos (x) = \frac{0}{\cos (x)} \cos (x)$

Step 53.42.1.1.3.2.3

Rewrite the expression.

$\cos (x) + \frac{2 \sin^{2} (x)}{\cos (x)} + \frac{\sin^{4} (x)}{\cos^{4} (x)} \cos (x) - \frac{1}{\cos^{4} (x)} \cos (x) = \frac{0}{\cos (x)} \cos (x)$

Step 53.42.1.1.3.3

Cancel the common factor of $\cos (x)$ .

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Step 53.42.1.1.3.3.1

Factor $\cos (x)$ out of $\cos^{4} (x)$ .

$\cos (x) + \frac{2 \sin^{2} (x)}{\cos (x)} + \frac{\sin^{4} (x)}{\cos (x) \cos^{3} (x)} \cos (x) - \frac{1}{\cos^{4} (x)} \cos (x) = \frac{0}{\cos (x)} \cos (x)$

Step 53.42.1.1.3.3.2

Cancel the common factor.

$\cos (x) + \frac{2 \sin^{2} (x)}{\cos (x)} + \frac{\sin^{4} (x)}{\cos (x) \cos^{3} (x)} \cos (x) - \frac{1}{\cos^{4} (x)} \cos (x) = \frac{0}{\cos (x)} \cos (x)$

Step 53.42.1.1.3.3.3

Rewrite the expression.

$\cos (x) + \frac{2 \sin^{2} (x)}{\cos (x)} + \frac{\sin^{4} (x)}{\cos^{3} (x)} - \frac{1}{\cos^{4} (x)} \cos (x) = \frac{0}{\cos (x)} \cos (x)$

Step 53.42.1.1.3.4

Cancel the common factor of $\cos (x)$ .

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Step 53.42.1.1.3.4.1

Move the leading negative in $- \frac{1}{\cos^{4} (x)}$ into the numerator.

$\cos (x) + \frac{2 \sin^{2} (x)}{\cos (x)} + \frac{\sin^{4} (x)}{\cos^{3} (x)} + \frac{- 1}{\cos^{4} (x)} \cos (x) = \frac{0}{\cos (x)} \cos (x)$

Step 53.42.1.1.3.4.2

Factor $\cos (x)$ out of $\cos^{4} (x)$ .

$\cos (x) + \frac{2 \sin^{2} (x)}{\cos (x)} + \frac{\sin^{4} (x)}{\cos^{3} (x)} + \frac{- 1}{\cos (x) \cos^{3} (x)} \cos (x) = \frac{0}{\cos (x)} \cos (x)$

Step 53.42.1.1.3.4.3

Cancel the common factor.

$\cos (x) + \frac{2 \sin^{2} (x)}{\cos (x)} + \frac{\sin^{4} (x)}{\cos^{3} (x)} + \frac{- 1}{\cos (x) \cos^{3} (x)} \cos (x) = \frac{0}{\cos (x)} \cos (x)$

Step 53.42.1.1.3.4.4

Rewrite the expression.

$\cos (x) + \frac{2 \sin^{2} (x)}{\cos (x)} + \frac{\sin^{4} (x)}{\cos^{3} (x)} + \frac{- 1}{\cos^{3} (x)} = \frac{0}{\cos (x)} \cos (x)$

Step 53.42.1.1.4

Move the negative in front of the fraction.

$\cos (x) + \frac{2 \sin^{2} (x)}{\cos (x)} + \frac{\sin^{4} (x)}{\cos^{3} (x)} - \frac{1}{\cos^{3} (x)} = \frac{0}{\cos (x)} \cos (x)$

Step 53.42.1.1.5

Simplify each term.

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Step 53.42.1.1.5.1

Factor $\sin (x)$ out of $\sin^{2} (x)$ .

$\cos (x) + \frac{2 (\sin (x) \sin (x))}{\cos (x)} + \frac{\sin^{4} (x)}{\cos^{3} (x)} - \frac{1}{\cos^{3} (x)} = \frac{0}{\cos (x)} \cos (x)$

Step 53.42.1.1.5.2

Separate fractions.

$\cos (x) + \frac{2 (\sin (x))}{1} \cdot \frac{\sin (x)}{\cos (x)} + \frac{\sin^{4} (x)}{\cos^{3} (x)} - \frac{1}{\cos^{3} (x)} = \frac{0}{\cos (x)} \cos (x)$

Step 53.42.1.1.5.3

Convert from $\frac{\sin (x)}{\cos (x)}$ to $\tan (x)$ .

$\cos (x) + \frac{2 (\sin (x))}{1} \tan (x) + \frac{\sin^{4} (x)}{\cos^{3} (x)} - \frac{1}{\cos^{3} (x)} = \frac{0}{\cos (x)} \cos (x)$

Step 53.42.1.1.5.4

Divide $2 (\sin (x))$ by $1$ .

$\cos (x) + 2 (\sin (x)) \tan (x) + \frac{\sin^{4} (x)}{\cos^{3} (x)} - \frac{1}{\cos^{3} (x)} = \frac{0}{\cos (x)} \cos (x)$

Step 53.42.1.1.5.5

Factor $\sin^{3} (x)$ out of $\sin^{4} (x)$ .

$\cos (x) + 2 \sin (x) \tan (x) + \frac{\sin^{3} (x) \sin (x)}{\cos^{3} (x)} - \frac{1}{\cos^{3} (x)} = \frac{0}{\cos (x)} \cos (x)$

Step 53.42.1.1.5.6

Multiply by $1$ .

$\cos (x) + 2 \sin (x) \tan (x) + \frac{\sin^{3} (x) \sin (x)}{\cos^{3} (x) \cdot 1} - \frac{1}{\cos^{3} (x)} = \frac{0}{\cos (x)} \cos (x)$

Step 53.42.1.1.5.7

Separate fractions.

$\cos (x) + 2 \sin (x) \tan (x) + \frac{\sin (x)}{1} \cdot \frac{\sin^{3} (x)}{\cos^{3} (x)} - \frac{1}{\cos^{3} (x)} = \frac{0}{\cos (x)} \cos (x)$

Step 53.42.1.1.5.8

Convert from $\frac{\sin^{3} (x)}{\cos^{3} (x)}$ to $\tan^{3} (x)$ .

$\cos (x) + 2 \sin (x) \tan (x) + \frac{\sin (x)}{1} \tan^{3} (x) - \frac{1}{\cos^{3} (x)} = \frac{0}{\cos (x)} \cos (x)$

Step 53.42.1.1.5.9

Divide $\sin (x)$ by $1$ .

$\cos (x) + 2 \sin (x) \tan (x) + \sin (x) \tan^{3} (x) - \frac{1}{\cos^{3} (x)} = \frac{0}{\cos (x)} \cos (x)$

Step 53.42.2

Simplify the right side.

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Step 53.42.2.1

Cancel the common factor of $\cos (x)$ .

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Step 53.42.2.1.1

Cancel the common factor.

$\cos (x) + 2 \sin (x) \tan (x) + \sin (x) \tan^{3} (x) - \frac{1}{\cos^{3} (x)} = \frac{0}{\cos (x)} \cos (x)$

Step 53.42.2.1.2

Rewrite the expression.

$\cos (x) + 2 \sin (x) \tan (x) + \sin (x) \tan^{3} (x) - \frac{1}{\cos^{3} (x)} = 0$

Step 53.43

Solve for $x$ .

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Step 53.43.1

Divide each term in the equation by $\cos (x)$ .

$\frac{\cos (x)}{\cos (x)} + \frac{2 \sin (x) \tan (x)}{\cos (x)} + \frac{\sin (x) \tan^{3} (x)}{\cos (x)} + \frac{- \frac{1}{\cos^{3} (x)}}{\cos (x)} = \frac{0}{\cos (x)}$

Step 53.43.2

Cancel the common factor of $\cos (x)$ .

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Step 53.43.2.1

Cancel the common factor.

$\frac{\cos (x)}{\cos (x)} + \frac{2 \sin (x) \tan (x)}{\cos (x)} + \frac{\sin (x) \tan^{3} (x)}{\cos (x)} + \frac{- \frac{1}{\cos^{3} (x)}}{\cos (x)} = \frac{0}{\cos (x)}$

Step 53.43.2.2

Rewrite the expression.

$1 + \frac{2 \sin (x) \tan (x)}{\cos (x)} + \frac{\sin (x) \tan^{3} (x)}{\cos (x)} + \frac{- \frac{1}{\cos^{3} (x)}}{\cos (x)} = \frac{0}{\cos (x)}$

Step 53.43.3

Simplify the numerator.

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Step 53.43.3.1

Rewrite $\tan (x)$ in terms of sines and cosines.

$1 + \frac{2 \sin (x) (\frac{\sin (x)}{\cos (x)})}{\cos (x)} + \frac{\sin (x) \tan^{3} (x)}{\cos (x)} + \frac{- \frac{1}{\cos^{3} (x)}}{\cos (x)} = \frac{0}{\cos (x)}$

Step 53.43.3.2

Combine exponents.

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Step 53.43.3.2.1

Combine $\frac{\sin (x)}{\cos (x)}$ and $2$ .

$1 + \frac{\frac{\sin (x) \cdot 2}{\cos (x)} \cdot \sin (x)}{\cos (x)} + \frac{\sin (x) \tan^{3} (x)}{\cos (x)} + \frac{- \frac{1}{\cos^{3} (x)}}{\cos (x)} = \frac{0}{\cos (x)}$

Step 53.43.3.2.2

Combine $\frac{\sin (x) \cdot 2}{\cos (x)}$ and $\sin (x)$ .

$1 + \frac{\frac{\sin (x) \cdot (2 \sin (x))}{\cos (x)}}{\cos (x)} + \frac{\sin (x) \tan^{3} (x)}{\cos (x)} + \frac{- \frac{1}{\cos^{3} (x)}}{\cos (x)} = \frac{0}{\cos (x)}$

Step 53.43.3.2.3

Raise $\sin (x)$ to the power of $1$ .

$1 + \frac{\frac{2 (\sin (x) \sin (x))}{\cos (x)}}{\cos (x)} + \frac{\sin (x) \tan^{3} (x)}{\cos (x)} + \frac{- \frac{1}{\cos^{3} (x)}}{\cos (x)} = \frac{0}{\cos (x)}$

Step 53.43.3.2.4

Raise $\sin (x)$ to the power of $1$ .

$1 + \frac{\frac{2 (\sin (x) \sin (x))}{\cos (x)}}{\cos (x)} + \frac{\sin (x) \tan^{3} (x)}{\cos (x)} + \frac{- \frac{1}{\cos^{3} (x)}}{\cos (x)} = \frac{0}{\cos (x)}$

Step 53.43.3.2.5

Use the power rule $a^{m} a^{n} = a^{m + n}$ to combine exponents.

$1 + \frac{\frac{2 {\sin (x)}^{1 + 1}}{\cos (x)}}{\cos (x)} + \frac{\sin (x) \tan^{3} (x)}{\cos (x)} + \frac{- \frac{1}{\cos^{3} (x)}}{\cos (x)} = \frac{0}{\cos (x)}$

Step 53.43.3.2.6

Add $1$ and $1$ .

$1 + \frac{\frac{2 \sin^{2} (x)}{\cos (x)}}{\cos (x)} + \frac{\sin (x) \tan^{3} (x)}{\cos (x)} + \frac{- \frac{1}{\cos^{3} (x)}}{\cos (x)} = \frac{0}{\cos (x)}$

Step 53.43.4

Multiply the numerator by the reciprocal of the denominator.

$1 + \frac{2 \sin^{2} (x)}{\cos (x)} \cdot \frac{1}{\cos (x)} + \frac{\sin (x) \tan^{3} (x)}{\cos (x)} + \frac{- \frac{1}{\cos^{3} (x)}}{\cos (x)} = \frac{0}{\cos (x)}$

Step 53.43.5

Combine fractions.

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Step 53.43.5.1

Combine.

$1 + \frac{2 \sin^{2} (x) \cdot 1}{\cos (x) \cos (x)} + \frac{\sin (x) \tan^{3} (x)}{\cos (x)} + \frac{- \frac{1}{\cos^{3} (x)}}{\cos (x)} = \frac{0}{\cos (x)}$

Step 53.43.5.2

Multiply $2$ by $1$ .

$1 + \frac{2 \sin^{2} (x)}{\cos (x) \cos (x)} + \frac{\sin (x) \tan^{3} (x)}{\cos (x)} + \frac{- \frac{1}{\cos^{3} (x)}}{\cos (x)} = \frac{0}{\cos (x)}$

Step 53.43.6

Simplify the denominator.

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Step 53.43.6.1

Use the power rule $a^{m} a^{n} = a^{m + n}$ to combine exponents.

$1 + \frac{2 \sin^{2} (x)}{{\cos (x)}^{1 + 1}} + \frac{\sin (x) \tan^{3} (x)}{\cos (x)} + \frac{- \frac{1}{\cos^{3} (x)}}{\cos (x)} = \frac{0}{\cos (x)}$

Step 53.43.6.2

Add $1$ and $1$ .

$1 + \frac{2 \sin^{2} (x)}{\cos^{2} (x)} + \frac{\sin (x) \tan^{3} (x)}{\cos (x)} + \frac{- \frac{1}{\cos^{3} (x)}}{\cos (x)} = \frac{0}{\cos (x)}$

Step 53.43.7

Multiply by $1$ .

$1 + \frac{2 (\sin^{2} (x) \cdot 1)}{\cos^{2} (x)} + \frac{\sin (x) \tan^{3} (x)}{\cos (x)} + \frac{- \frac{1}{\cos^{3} (x)}}{\cos (x)} = \frac{0}{\cos (x)}$

Step 53.43.8

Multiply by $1$ .

$1 + \frac{2 (\sin^{2} (x) \cdot 1)}{\cos^{2} (x) \cdot 1} + \frac{\sin (x) \tan^{3} (x)}{\cos (x)} + \frac{- \frac{1}{\cos^{3} (x)}}{\cos (x)} = \frac{0}{\cos (x)}$

Step 53.43.9

Separate fractions.

$1 + \frac{2 \cdot (1)}{1} \cdot \frac{\sin^{2} (x)}{\cos^{2} (x)} + \frac{\sin (x) \tan^{3} (x)}{\cos (x)} + \frac{- \frac{1}{\cos^{3} (x)}}{\cos (x)} = \frac{0}{\cos (x)}$

Step 53.43.10

Convert from $\frac{\sin^{2} (x)}{\cos^{2} (x)}$ to $\tan^{2} (x)$ .

$1 + \frac{2 \cdot (1)}{1} \cdot \tan^{2} (x) + \frac{\sin (x) \tan^{3} (x)}{\cos (x)} + \frac{- \frac{1}{\cos^{3} (x)}}{\cos (x)} = \frac{0}{\cos (x)}$

Step 53.43.11

Multiply $2$ by $1$ .

$1 + \frac{2}{1} \cdot \tan^{2} (x) + \frac{\sin (x) \tan^{3} (x)}{\cos (x)} + \frac{- \frac{1}{\cos^{3} (x)}}{\cos (x)} = \frac{0}{\cos (x)}$

Step 53.43.12

Divide $2$ by $1$ .

$1 + 2 \tan^{2} (x) + \frac{\sin (x) \tan^{3} (x)}{\cos (x)} + \frac{- \frac{1}{\cos^{3} (x)}}{\cos (x)} = \frac{0}{\cos (x)}$

Step 53.43.13

Simplify the numerator.

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Step 53.43.13.1

Rewrite $\tan (x)$ in terms of sines and cosines.

$1 + 2 \tan^{2} (x) + \frac{\sin (x) {(\frac{\sin (x)}{\cos (x)})}^{3}}{\cos (x)} + \frac{- \frac{1}{\cos^{3} (x)}}{\cos (x)} = \frac{0}{\cos (x)}$

Step 53.43.13.2

Apply the product rule to $\frac{\sin (x)}{\cos (x)}$ .

$1 + 2 \tan^{2} (x) + \frac{\sin (x) (\frac{\sin^{3} (x)}{\cos^{3} (x)})}{\cos (x)} + \frac{- \frac{1}{\cos^{3} (x)}}{\cos (x)} = \frac{0}{\cos (x)}$

Step 53.43.14

Combine $\sin (x)$ and $\frac{\sin^{3} (x)}{\cos^{3} (x)}$ .

$1 + 2 \tan^{2} (x) + \frac{\frac{\sin (x) \sin^{3} (x)}{\cos^{3} (x)}}{\cos (x)} + \frac{- \frac{1}{\cos^{3} (x)}}{\cos (x)} = \frac{0}{\cos (x)}$

Step 53.43.15

Multiply $\sin (x)$ by $\sin^{3} (x)$ by adding the exponents.

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Step 53.43.15.1

Multiply $\sin (x)$ by $\sin^{3} (x)$ .

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Step 53.43.15.1.1

Raise $\sin (x)$ to the power of $1$ .

$1 + 2 \tan^{2} (x) + \frac{\frac{\sin (x) \sin^{3} (x)}{\cos^{3} (x)}}{\cos (x)} + \frac{- \frac{1}{\cos^{3} (x)}}{\cos (x)} = \frac{0}{\cos (x)}$

Step 53.43.15.1.2

Use the power rule $a^{m} a^{n} = a^{m + n}$ to combine exponents.

$1 + 2 \tan^{2} (x) + \frac{\frac{{\sin (x)}^{1 + 3}}{\cos^{3} (x)}}{\cos (x)} + \frac{- \frac{1}{\cos^{3} (x)}}{\cos (x)} = \frac{0}{\cos (x)}$

Step 53.43.15.2

Add $1$ and $3$ .

$1 + 2 \tan^{2} (x) + \frac{\frac{\sin^{4} (x)}{\cos^{3} (x)}}{\cos (x)} + \frac{- \frac{1}{\cos^{3} (x)}}{\cos (x)} = \frac{0}{\cos (x)}$

Step 53.43.16

Multiply the numerator by the reciprocal of the denominator.

$1 + 2 \tan^{2} (x) + \frac{\sin^{4} (x)}{\cos^{3} (x)} \cdot \frac{1}{\cos (x)} + \frac{- \frac{1}{\cos^{3} (x)}}{\cos (x)} = \frac{0}{\cos (x)}$

Step 53.43.17

Combine.

$1 + 2 \tan^{2} (x) + \frac{\sin^{4} (x) \cdot 1}{\cos^{3} (x) \cos (x)} + \frac{- \frac{1}{\cos^{3} (x)}}{\cos (x)} = \frac{0}{\cos (x)}$

Step 53.43.18

Multiply $\cos^{3} (x)$ by $\cos (x)$ by adding the exponents.

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Step 53.43.18.1

Multiply $\cos^{3} (x)$ by $\cos (x)$ .

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Step 53.43.18.1.1

Raise $\cos (x)$ to the power of $1$ .

$1 + 2 \tan^{2} (x) + \frac{\sin^{4} (x) \cdot 1}{\cos^{3} (x) \cos (x)} + \frac{- \frac{1}{\cos^{3} (x)}}{\cos (x)} = \frac{0}{\cos (x)}$

Step 53.43.18.1.2

Use the power rule $a^{m} a^{n} = a^{m + n}$ to combine exponents.

$1 + 2 \tan^{2} (x) + \frac{\sin^{4} (x) \cdot 1}{{\cos (x)}^{3 + 1}} + \frac{- \frac{1}{\cos^{3} (x)}}{\cos (x)} = \frac{0}{\cos (x)}$

Step 53.43.18.2

Add $3$ and $1$ .

$1 + 2 \tan^{2} (x) + \frac{\sin^{4} (x) \cdot 1}{\cos^{4} (x)} + \frac{- \frac{1}{\cos^{3} (x)}}{\cos (x)} = \frac{0}{\cos (x)}$

Step 53.43.19

Multiply $\sin^{4} (x)$ by $1$ .

$1 + 2 \tan^{2} (x) + \frac{\sin^{4} (x)}{\cos^{4} (x)} + \frac{- \frac{1}{\cos^{3} (x)}}{\cos (x)} = \frac{0}{\cos (x)}$

Step 53.43.20

Convert from $\frac{\sin^{4} (x)}{\cos^{4} (x)}$ to $\tan^{4} (x)$ .

$1 + 2 \tan^{2} (x) + \tan^{4} (x) + \frac{- \frac{1}{\cos^{3} (x)}}{\cos (x)} = \frac{0}{\cos (x)}$

Step 53.43.21

Multiply the numerator by the reciprocal of the denominator.

$1 + 2 \tan^{2} (x) + \tan^{4} (x) - \frac{1}{\cos^{3} (x)} \cdot \frac{1}{\cos (x)} = \frac{0}{\cos (x)}$

Step 53.43.22

Convert from $\frac{1}{\cos (x)}$ to $\sec (x)$ .

$1 + 2 \tan^{2} (x) + \tan^{4} (x) - \frac{1}{\cos^{3} (x)} \cdot \sec (x) = \frac{0}{\cos (x)}$

Step 53.43.23

Combine $\sec (x)$ and $\frac{1}{\cos^{3} (x)}$ .

$1 + 2 \tan^{2} (x) + \tan^{4} (x) - \frac{\sec (x)}{\cos^{3} (x)} = \frac{0}{\cos (x)}$

Step 53.43.24

Factor $\cos (x)$ out of $\cos^{3} (x)$ .

$1 + 2 \tan^{2} (x) + \tan^{4} (x) - \frac{\sec (x)}{\cos (x) \cos^{2} (x)} = \frac{0}{\cos (x)}$

Step 53.43.25

Separate fractions.

$1 + 2 \tan^{2} (x) + \tan^{4} (x) - (\frac{1}{\cos^{2} (x)} \cdot \frac{\sec (x)}{\cos (x)}) = \frac{0}{\cos (x)}$

Step 53.43.26

Rewrite $\sec (x)$ in terms of sines and cosines.

$1 + 2 \tan^{2} (x) + \tan^{4} (x) - (\frac{1}{\cos^{2} (x)} \cdot \frac{\frac{1}{\cos (x)}}{\cos (x)}) = \frac{0}{\cos (x)}$

Step 53.43.27

Rewrite $\frac{\frac{1}{\cos (x)}}{\cos (x)}$ as a product.

$1 + 2 \tan^{2} (x) + \tan^{4} (x) - (\frac{1}{\cos^{2} (x)} \cdot (\frac{1}{\cos (x)} \cdot \frac{1}{\cos (x)})) = \frac{0}{\cos (x)}$

Step 53.43.28

Simplify.

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Step 53.43.28.1

Convert from $\frac{1}{\cos (x)}$ to $\sec (x)$ .

$1 + 2 \tan^{2} (x) + \tan^{4} (x) - (\frac{1}{\cos^{2} (x)} \cdot (\sec (x) (\frac{1}{\cos (x)}))) = \frac{0}{\cos (x)}$

Step 53.43.28.2

Convert from $\frac{1}{\cos (x)}$ to $\sec (x)$ .

$1 + 2 \tan^{2} (x) + \tan^{4} (x) - (\frac{1}{\cos^{2} (x)} \cdot (\sec (x) \sec (x))) = \frac{0}{\cos (x)}$

Step 53.43.28.3

Raise $\sec (x)$ to the power of $1$ .

$1 + 2 \tan^{2} (x) + \tan^{4} (x) - (\frac{1}{\cos^{2} (x)} \cdot (\sec (x) \sec (x))) = \frac{0}{\cos (x)}$

Step 53.43.28.4

Raise $\sec (x)$ to the power of $1$ .

$1 + 2 \tan^{2} (x) + \tan^{4} (x) - (\frac{1}{\cos^{2} (x)} \cdot (\sec (x) \sec (x))) = \frac{0}{\cos (x)}$

Step 53.43.28.5

Use the power rule $a^{m} a^{n} = a^{m + n}$ to combine exponents.

$1 + 2 \tan^{2} (x) + \tan^{4} (x) - (\frac{1}{\cos^{2} (x)} \cdot {\sec (x)}^{1 + 1}) = \frac{0}{\cos (x)}$

Step 53.43.28.6

Add $1$ and $1$ .

$1 + 2 \tan^{2} (x) + \tan^{4} (x) - (\frac{1}{\cos^{2} (x)} \cdot \sec^{2} (x)) = \frac{0}{\cos (x)}$

Step 53.43.29

Rewrite $1$ as $1^{2}$ .

$1 + 2 \tan^{2} (x) + \tan^{4} (x) - (\frac{1^{2}}{\cos^{2} (x)} \cdot \sec^{2} (x)) = \frac{0}{\cos (x)}$

Step 53.43.30

Rewrite $\frac{1^{2}}{\cos^{2} (x)}$ as ${(\frac{1}{\cos (x)})}^{2}$ .

$1 + 2 \tan^{2} (x) + \tan^{4} (x) - ({(\frac{1}{\cos (x)})}^{2} \sec^{2} (x)) = \frac{0}{\cos (x)}$

Step 53.43.31

Convert from $\frac{1}{\cos (x)}$ to $\sec (x)$ .

$1 + 2 \tan^{2} (x) + \tan^{4} (x) - (\sec^{2} (x) \sec^{2} (x)) = \frac{0}{\cos (x)}$

Step 53.43.32

Multiply $\sec^{2} (x)$ by $\sec^{2} (x)$ by adding the exponents.

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Step 53.43.32.1

Use the power rule $a^{m} a^{n} = a^{m + n}$ to combine exponents.

$1 + 2 \tan^{2} (x) + \tan^{4} (x) - {\sec (x)}^{2 + 2} = \frac{0}{\cos (x)}$

Step 53.43.32.2

Add $2$ and $2$ .

$1 + 2 \tan^{2} (x) + \tan^{4} (x) - \sec^{4} (x) = \frac{0}{\cos (x)}$

Step 53.43.33

Separate fractions.

$1 + 2 \tan^{2} (x) + \tan^{4} (x) - \sec^{4} (x) = \frac{0}{1} \cdot \frac{1}{\cos (x)}$

Step 53.43.34

Convert from $\frac{1}{\cos (x)}$ to $\sec (x)$ .

$1 + 2 \tan^{2} (x) + \tan^{4} (x) - \sec^{4} (x) = \frac{0}{1} \cdot \sec (x)$

Step 53.43.35

Divide $0$ by $1$ .

$1 + 2 \tan^{2} (x) + \tan^{4} (x) - \sec^{4} (x) = 0 \sec (x)$

Step 53.43.36

Multiply $0$ by $\sec (x)$ .

$1 + 2 \tan^{2} (x) + \tan^{4} (x) - \sec^{4} (x) = 0$

Step 53.43.37

Replace the $2 \tan^{2} (x)$ with $2 (\sec^{2} (x) - 1)$ based on the $\tan^{2} (x) + 1 = \sec^{2} (x)$ identity.

$1 + 2 (\sec^{2} (x) - 1) + \tan^{4} (x) - \sec^{4} (x) = 0$

Step 53.43.38

Simplify each term.

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Step 53.43.38.1

Apply the distributive property.

$1 + 2 \sec^{2} (x) + 2 \cdot - 1 + \tan^{4} (x) - \sec^{4} (x) = 0$

Step 53.43.38.2

Multiply $2$ by $- 1$ .

$1 + 2 \sec^{2} (x) - 2 + \tan^{4} (x) - \sec^{4} (x) = 0$

Step 53.43.39

Subtract $2$ from $1$ .

$2 \sec^{2} (x) - 1 + \tan^{4} (x) - \sec^{4} (x) = 0$

Step 53.43.40

Reorder the polynomial.

$\tan^{4} (x) - \sec^{4} (x) + 2 \sec^{2} (x) - 1 = 0$

Step 53.43.41

Multiply both sides by $\cos (x)$ .

$(1 + 2 \tan^{2} (x) + \tan^{4} (x) - \sec^{4} (x)) \cos (x) = \frac{0}{\cos (x)} \cos (x)$

Step 53.43.42

Simplify.

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Step 53.43.42.1

Simplify the left side.

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Step 53.43.42.1.1

Simplify $(1 + 2 \tan^{2} (x) + \tan^{4} (x) - \sec^{4} (x)) \cos (x)$ .

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Step 53.43.42.1.1.1

Simplify each term.

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Step 53.43.42.1.1.1.1

Rewrite $\tan (x)$ in terms of sines and cosines.

$(1 + 2 {(\frac{\sin (x)}{\cos (x)})}^{2} + \tan^{4} (x) - \sec^{4} (x)) \cos (x) = \frac{0}{\cos (x)} \cos (x)$

Step 53.43.42.1.1.1.2

Apply the product rule to $\frac{\sin (x)}{\cos (x)}$ .

$(1 + 2 \frac{\sin^{2} (x)}{\cos^{2} (x)} + \tan^{4} (x) - \sec^{4} (x)) \cos (x) = \frac{0}{\cos (x)} \cos (x)$

Step 53.43.42.1.1.1.3

Combine $2$ and $\frac{\sin^{2} (x)}{\cos^{2} (x)}$ .

$(1 + \frac{2 \sin^{2} (x)}{\cos^{2} (x)} + \tan^{4} (x) - \sec^{4} (x)) \cos (x) = \frac{0}{\cos (x)} \cos (x)$

Step 53.43.42.1.1.1.4

Rewrite $\tan (x)$ in terms of sines and cosines.

$(1 + \frac{2 \sin^{2} (x)}{\cos^{2} (x)} + {(\frac{\sin (x)}{\cos (x)})}^{4} - \sec^{4} (x)) \cos (x) = \frac{0}{\cos (x)} \cos (x)$

Step 53.43.42.1.1.1.5

Apply the product rule to $\frac{\sin (x)}{\cos (x)}$ .

$(1 + \frac{2 \sin^{2} (x)}{\cos^{2} (x)} + \frac{\sin^{4} (x)}{\cos^{4} (x)} - \sec^{4} (x)) \cos (x) = \frac{0}{\cos (x)} \cos (x)$

Step 53.43.42.1.1.1.6

Rewrite $\sec (x)$ in terms of sines and cosines.

$(1 + \frac{2 \sin^{2} (x)}{\cos^{2} (x)} + \frac{\sin^{4} (x)}{\cos^{4} (x)} - {(\frac{1}{\cos (x)})}^{4}) \cos (x) = \frac{0}{\cos (x)} \cos (x)$

Step 53.43.42.1.1.1.7

Apply the product rule to $\frac{1}{\cos (x)}$ .

$(1 + \frac{2 \sin^{2} (x)}{\cos^{2} (x)} + \frac{\sin^{4} (x)}{\cos^{4} (x)} - \frac{1^{4}}{\cos^{4} (x)}) \cos (x) = \frac{0}{\cos (x)} \cos (x)$

Step 53.43.42.1.1.1.8

One to any power is one.

$(1 + \frac{2 \sin^{2} (x)}{\cos^{2} (x)} + \frac{\sin^{4} (x)}{\cos^{4} (x)} - \frac{1}{\cos^{4} (x)}) \cos (x) = \frac{0}{\cos (x)} \cos (x)$

Step 53.43.42.1.1.2

Apply the distributive property.

$1 \cos (x) + \frac{2 \sin^{2} (x)}{\cos^{2} (x)} \cos (x) + \frac{\sin^{4} (x)}{\cos^{4} (x)} \cos (x) - \frac{1}{\cos^{4} (x)} \cos (x) = \frac{0}{\cos (x)} \cos (x)$

Step 53.43.42.1.1.3

Simplify.

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Step 53.43.42.1.1.3.1

Multiply $\cos (x)$ by $1$ .

$\cos (x) + \frac{2 \sin^{2} (x)}{\cos^{2} (x)} \cos (x) + \frac{\sin^{4} (x)}{\cos^{4} (x)} \cos (x) - \frac{1}{\cos^{4} (x)} \cos (x) = \frac{0}{\cos (x)} \cos (x)$

Step 53.43.42.1.1.3.2

Cancel the common factor of $\cos (x)$ .

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Step 53.43.42.1.1.3.2.1

Factor $\cos (x)$ out of $\cos^{2} (x)$ .

$\cos (x) + \frac{2 \sin^{2} (x)}{\cos (x) \cos (x)} \cos (x) + \frac{\sin^{4} (x)}{\cos^{4} (x)} \cos (x) - \frac{1}{\cos^{4} (x)} \cos (x) = \frac{0}{\cos (x)} \cos (x)$

Step 53.43.42.1.1.3.2.2

Cancel the common factor.

$\cos (x) + \frac{2 \sin^{2} (x)}{\cos (x) \cos (x)} \cos (x) + \frac{\sin^{4} (x)}{\cos^{4} (x)} \cos (x) - \frac{1}{\cos^{4} (x)} \cos (x) = \frac{0}{\cos (x)} \cos (x)$

Step 53.43.42.1.1.3.2.3

Rewrite the expression.

$\cos (x) + \frac{2 \sin^{2} (x)}{\cos (x)} + \frac{\sin^{4} (x)}{\cos^{4} (x)} \cos (x) - \frac{1}{\cos^{4} (x)} \cos (x) = \frac{0}{\cos (x)} \cos (x)$

Step 53.43.42.1.1.3.3

Cancel the common factor of $\cos (x)$ .

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Step 53.43.42.1.1.3.3.1

Factor $\cos (x)$ out of $\cos^{4} (x)$ .

$\cos (x) + \frac{2 \sin^{2} (x)}{\cos (x)} + \frac{\sin^{4} (x)}{\cos (x) \cos^{3} (x)} \cos (x) - \frac{1}{\cos^{4} (x)} \cos (x) = \frac{0}{\cos (x)} \cos (x)$

Step 53.43.42.1.1.3.3.2

Cancel the common factor.

$\cos (x) + \frac{2 \sin^{2} (x)}{\cos (x)} + \frac{\sin^{4} (x)}{\cos (x) \cos^{3} (x)} \cos (x) - \frac{1}{\cos^{4} (x)} \cos (x) = \frac{0}{\cos (x)} \cos (x)$

Step 53.43.42.1.1.3.3.3

Rewrite the expression.

$\cos (x) + \frac{2 \sin^{2} (x)}{\cos (x)} + \frac{\sin^{4} (x)}{\cos^{3} (x)} - \frac{1}{\cos^{4} (x)} \cos (x) = \frac{0}{\cos (x)} \cos (x)$

Step 53.43.42.1.1.3.4

Cancel the common factor of $\cos (x)$ .

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Step 53.43.42.1.1.3.4.1

Move the leading negative in $- \frac{1}{\cos^{4} (x)}$ into the numerator.

$\cos (x) + \frac{2 \sin^{2} (x)}{\cos (x)} + \frac{\sin^{4} (x)}{\cos^{3} (x)} + \frac{- 1}{\cos^{4} (x)} \cos (x) = \frac{0}{\cos (x)} \cos (x)$

Step 53.43.42.1.1.3.4.2

Factor $\cos (x)$ out of $\cos^{4} (x)$ .

$\cos (x) + \frac{2 \sin^{2} (x)}{\cos (x)} + \frac{\sin^{4} (x)}{\cos^{3} (x)} + \frac{- 1}{\cos (x) \cos^{3} (x)} \cos (x) = \frac{0}{\cos (x)} \cos (x)$

Step 53.43.42.1.1.3.4.3

Cancel the common factor.

$\cos (x) + \frac{2 \sin^{2} (x)}{\cos (x)} + \frac{\sin^{4} (x)}{\cos^{3} (x)} + \frac{- 1}{\cos (x) \cos^{3} (x)} \cos (x) = \frac{0}{\cos (x)} \cos (x)$

Step 53.43.42.1.1.3.4.4

Rewrite the expression.

$\cos (x) + \frac{2 \sin^{2} (x)}{\cos (x)} + \frac{\sin^{4} (x)}{\cos^{3} (x)} + \frac{- 1}{\cos^{3} (x)} = \frac{0}{\cos (x)} \cos (x)$

Step 53.43.42.1.1.4

Move the negative in front of the fraction.

$\cos (x) + \frac{2 \sin^{2} (x)}{\cos (x)} + \frac{\sin^{4} (x)}{\cos^{3} (x)} - \frac{1}{\cos^{3} (x)} = \frac{0}{\cos (x)} \cos (x)$

Step 53.43.42.1.1.5

Simplify each term.

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Step 53.43.42.1.1.5.1

Factor $\sin (x)$ out of $\sin^{2} (x)$ .

$\cos (x) + \frac{2 (\sin (x) \sin (x))}{\cos (x)} + \frac{\sin^{4} (x)}{\cos^{3} (x)} - \frac{1}{\cos^{3} (x)} = \frac{0}{\cos (x)} \cos (x)$

Step 53.43.42.1.1.5.2

Separate fractions.

$\cos (x) + \frac{2 (\sin (x))}{1} \cdot \frac{\sin (x)}{\cos (x)} + \frac{\sin^{4} (x)}{\cos^{3} (x)} - \frac{1}{\cos^{3} (x)} = \frac{0}{\cos (x)} \cos (x)$

Step 53.43.42.1.1.5.3

Convert from $\frac{\sin (x)}{\cos (x)}$ to $\tan (x)$ .

$\cos (x) + \frac{2 (\sin (x))}{1} \tan (x) + \frac{\sin^{4} (x)}{\cos^{3} (x)} - \frac{1}{\cos^{3} (x)} = \frac{0}{\cos (x)} \cos (x)$

Step 53.43.42.1.1.5.4

Divide $2 (\sin (x))$ by $1$ .

$\cos (x) + 2 (\sin (x)) \tan (x) + \frac{\sin^{4} (x)}{\cos^{3} (x)} - \frac{1}{\cos^{3} (x)} = \frac{0}{\cos (x)} \cos (x)$

Step 53.43.42.1.1.5.5

Factor $\sin^{3} (x)$ out of $\sin^{4} (x)$ .

$\cos (x) + 2 \sin (x) \tan (x) + \frac{\sin^{3} (x) \sin (x)}{\cos^{3} (x)} - \frac{1}{\cos^{3} (x)} = \frac{0}{\cos (x)} \cos (x)$

Step 53.43.42.1.1.5.6

Multiply by $1$ .

$\cos (x) + 2 \sin (x) \tan (x) + \frac{\sin^{3} (x) \sin (x)}{\cos^{3} (x) \cdot 1} - \frac{1}{\cos^{3} (x)} = \frac{0}{\cos (x)} \cos (x)$

Step 53.43.42.1.1.5.7

Separate fractions.

$\cos (x) + 2 \sin (x) \tan (x) + \frac{\sin (x)}{1} \cdot \frac{\sin^{3} (x)}{\cos^{3} (x)} - \frac{1}{\cos^{3} (x)} = \frac{0}{\cos (x)} \cos (x)$

Step 53.43.42.1.1.5.8

Convert from $\frac{\sin^{3} (x)}{\cos^{3} (x)}$ to $\tan^{3} (x)$ .

$\cos (x) + 2 \sin (x) \tan (x) + \frac{\sin (x)}{1} \tan^{3} (x) - \frac{1}{\cos^{3} (x)} = \frac{0}{\cos (x)} \cos (x)$

Step 53.43.42.1.1.5.9

Divide $\sin (x)$ by $1$ .

$\cos (x) + 2 \sin (x) \tan (x) + \sin (x) \tan^{3} (x) - \frac{1}{\cos^{3} (x)} = \frac{0}{\cos (x)} \cos (x)$

Step 53.43.42.2

Simplify the right side.

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Step 53.43.42.2.1

Cancel the common factor of $\cos (x)$ .

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Step 53.43.42.2.1.1

Cancel the common factor.

$\cos (x) + 2 \sin (x) \tan (x) + \sin (x) \tan^{3} (x) - \frac{1}{\cos^{3} (x)} = \frac{0}{\cos (x)} \cos (x)$

Step 53.43.42.2.1.2

Rewrite the expression.

$\cos (x) + 2 \sin (x) \tan (x) + \sin (x) \tan^{3} (x) - \frac{1}{\cos^{3} (x)} = 0$

Step 53.43.43

Solve for $x$ .

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Step 53.43.43.1

Divide each term in the equation by $\cos (x)$ .

$\frac{\cos (x)}{\cos (x)} + \frac{2 \sin (x) \tan (x)}{\cos (x)} + \frac{\sin (x) \tan^{3} (x)}{\cos (x)} + \frac{- \frac{1}{\cos^{3} (x)}}{\cos (x)} = \frac{0}{\cos (x)}$

Step 53.43.43.2

Cancel the common factor of $\cos (x)$ .

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Step 53.43.43.2.1

Cancel the common factor.

$\frac{\cos (x)}{\cos (x)} + \frac{2 \sin (x) \tan (x)}{\cos (x)} + \frac{\sin (x) \tan^{3} (x)}{\cos (x)} + \frac{- \frac{1}{\cos^{3} (x)}}{\cos (x)} = \frac{0}{\cos (x)}$

Step 53.43.43.2.2

Rewrite the expression.

$1 + \frac{2 \sin (x) \tan (x)}{\cos (x)} + \frac{\sin (x) \tan^{3} (x)}{\cos (x)} + \frac{- \frac{1}{\cos^{3} (x)}}{\cos (x)} = \frac{0}{\cos (x)}$

Step 53.43.43.3

Simplify the numerator.

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Step 53.43.43.3.1

Rewrite $\tan (x)$ in terms of sines and cosines.

$1 + \frac{2 \sin (x) (\frac{\sin (x)}{\cos (x)})}{\cos (x)} + \frac{\sin (x) \tan^{3} (x)}{\cos (x)} + \frac{- \frac{1}{\cos^{3} (x)}}{\cos (x)} = \frac{0}{\cos (x)}$

Step 53.43.43.3.2

Combine exponents.

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Step 53.43.43.3.2.1

Combine $\frac{\sin (x)}{\cos (x)}$ and $2$ .

$1 + \frac{\frac{\sin (x) \cdot 2}{\cos (x)} \cdot \sin (x)}{\cos (x)} + \frac{\sin (x) \tan^{3} (x)}{\cos (x)} + \frac{- \frac{1}{\cos^{3} (x)}}{\cos (x)} = \frac{0}{\cos (x)}$

Step 53.43.43.3.2.2

Combine $\frac{\sin (x) \cdot 2}{\cos (x)}$ and $\sin (x)$ .

$1 + \frac{\frac{\sin (x) \cdot (2 \sin (x))}{\cos (x)}}{\cos (x)} + \frac{\sin (x) \tan^{3} (x)}{\cos (x)} + \frac{- \frac{1}{\cos^{3} (x)}}{\cos (x)} = \frac{0}{\cos (x)}$

Step 53.43.43.3.2.3

Raise $\sin (x)$ to the power of $1$ .

$1 + \frac{\frac{2 (\sin (x) \sin (x))}{\cos (x)}}{\cos (x)} + \frac{\sin (x) \tan^{3} (x)}{\cos (x)} + \frac{- \frac{1}{\cos^{3} (x)}}{\cos (x)} = \frac{0}{\cos (x)}$

Step 53.43.43.3.2.4

Raise $\sin (x)$ to the power of $1$ .

$1 + \frac{\frac{2 (\sin (x) \sin (x))}{\cos (x)}}{\cos (x)} + \frac{\sin (x) \tan^{3} (x)}{\cos (x)} + \frac{- \frac{1}{\cos^{3} (x)}}{\cos (x)} = \frac{0}{\cos (x)}$

Step 53.43.43.3.2.5

Use the power rule $a^{m} a^{n} = a^{m + n}$ to combine exponents.

$1 + \frac{\frac{2 {\sin (x)}^{1 + 1}}{\cos (x)}}{\cos (x)} + \frac{\sin (x) \tan^{3} (x)}{\cos (x)} + \frac{- \frac{1}{\cos^{3} (x)}}{\cos (x)} = \frac{0}{\cos (x)}$

Step 53.43.43.3.2.6

Add $1$ and $1$ .

$1 + \frac{\frac{2 \sin^{2} (x)}{\cos (x)}}{\cos (x)} + \frac{\sin (x) \tan^{3} (x)}{\cos (x)} + \frac{- \frac{1}{\cos^{3} (x)}}{\cos (x)} = \frac{0}{\cos (x)}$

Step 53.43.43.4

Multiply the numerator by the reciprocal of the denominator.

$1 + \frac{2 \sin^{2} (x)}{\cos (x)} \cdot \frac{1}{\cos (x)} + \frac{\sin (x) \tan^{3} (x)}{\cos (x)} + \frac{- \frac{1}{\cos^{3} (x)}}{\cos (x)} = \frac{0}{\cos (x)}$

Step 53.43.43.5

Combine fractions.

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Step 53.43.43.5.1

Combine.

$1 + \frac{2 \sin^{2} (x) \cdot 1}{\cos (x) \cos (x)} + \frac{\sin (x) \tan^{3} (x)}{\cos (x)} + \frac{- \frac{1}{\cos^{3} (x)}}{\cos (x)} = \frac{0}{\cos (x)}$

Step 53.43.43.5.2

Multiply $2$ by $1$ .

$1 + \frac{2 \sin^{2} (x)}{\cos (x) \cos (x)} + \frac{\sin (x) \tan^{3} (x)}{\cos (x)} + \frac{- \frac{1}{\cos^{3} (x)}}{\cos (x)} = \frac{0}{\cos (x)}$

Step 53.43.43.6

Simplify the denominator.

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Step 53.43.43.6.1

Use the power rule $a^{m} a^{n} = a^{m + n}$ to combine exponents.

$1 + \frac{2 \sin^{2} (x)}{{\cos (x)}^{1 + 1}} + \frac{\sin (x) \tan^{3} (x)}{\cos (x)} + \frac{- \frac{1}{\cos^{3} (x)}}{\cos (x)} = \frac{0}{\cos (x)}$

Step 53.43.43.6.2

Add $1$ and $1$ .

$1 + \frac{2 \sin^{2} (x)}{\cos^{2} (x)} + \frac{\sin (x) \tan^{3} (x)}{\cos (x)} + \frac{- \frac{1}{\cos^{3} (x)}}{\cos (x)} = \frac{0}{\cos (x)}$

Step 53.43.43.7

Multiply by $1$ .

$1 + \frac{2 (\sin^{2} (x) \cdot 1)}{\cos^{2} (x)} + \frac{\sin (x) \tan^{3} (x)}{\cos (x)} + \frac{- \frac{1}{\cos^{3} (x)}}{\cos (x)} = \frac{0}{\cos (x)}$

Step 53.43.43.8

Multiply by $1$ .

$1 + \frac{2 (\sin^{2} (x) \cdot 1)}{\cos^{2} (x) \cdot 1} + \frac{\sin (x) \tan^{3} (x)}{\cos (x)} + \frac{- \frac{1}{\cos^{3} (x)}}{\cos (x)} = \frac{0}{\cos (x)}$

Step 53.43.43.9

Separate fractions.

$1 + \frac{2 \cdot (1)}{1} \cdot \frac{\sin^{2} (x)}{\cos^{2} (x)} + \frac{\sin (x) \tan^{3} (x)}{\cos (x)} + \frac{- \frac{1}{\cos^{3} (x)}}{\cos (x)} = \frac{0}{\cos (x)}$

Step 53.43.43.10

Convert from $\frac{\sin^{2} (x)}{\cos^{2} (x)}$ to $\tan^{2} (x)$ .

$1 + \frac{2 \cdot (1)}{1} \cdot \tan^{2} (x) + \frac{\sin (x) \tan^{3} (x)}{\cos (x)} + \frac{- \frac{1}{\cos^{3} (x)}}{\cos (x)} = \frac{0}{\cos (x)}$

Step 53.43.43.11

Multiply $2$ by $1$ .

$1 + \frac{2}{1} \cdot \tan^{2} (x) + \frac{\sin (x) \tan^{3} (x)}{\cos (x)} + \frac{- \frac{1}{\cos^{3} (x)}}{\cos (x)} = \frac{0}{\cos (x)}$

Step 53.43.43.12

Divide $2$ by $1$ .

$1 + 2 \tan^{2} (x) + \frac{\sin (x) \tan^{3} (x)}{\cos (x)} + \frac{- \frac{1}{\cos^{3} (x)}}{\cos (x)} = \frac{0}{\cos (x)}$

Step 53.43.43.13

Simplify the numerator.

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Step 53.43.43.13.1

Rewrite $\tan (x)$ in terms of sines and cosines.

$1 + 2 \tan^{2} (x) + \frac{\sin (x) {(\frac{\sin (x)}{\cos (x)})}^{3}}{\cos (x)} + \frac{- \frac{1}{\cos^{3} (x)}}{\cos (x)} = \frac{0}{\cos (x)}$

Step 53.43.43.13.2

Apply the product rule to $\frac{\sin (x)}{\cos (x)}$ .

$1 + 2 \tan^{2} (x) + \frac{\sin (x) (\frac{\sin^{3} (x)}{\cos^{3} (x)})}{\cos (x)} + \frac{- \frac{1}{\cos^{3} (x)}}{\cos (x)} = \frac{0}{\cos (x)}$

Step 53.43.43.14

Combine $\sin (x)$ and $\frac{\sin^{3} (x)}{\cos^{3} (x)}$ .

$1 + 2 \tan^{2} (x) + \frac{\frac{\sin (x) \sin^{3} (x)}{\cos^{3} (x)}}{\cos (x)} + \frac{- \frac{1}{\cos^{3} (x)}}{\cos (x)} = \frac{0}{\cos (x)}$

Step 53.43.43.15

Multiply $\sin (x)$ by $\sin^{3} (x)$ by adding the exponents.

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Step 53.43.43.15.1

Multiply $\sin (x)$ by $\sin^{3} (x)$ .

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Step 53.43.43.15.1.1

Raise $\sin (x)$ to the power of $1$ .

$1 + 2 \tan^{2} (x) + \frac{\frac{\sin (x) \sin^{3} (x)}{\cos^{3} (x)}}{\cos (x)} + \frac{- \frac{1}{\cos^{3} (x)}}{\cos (x)} = \frac{0}{\cos (x)}$

Step 53.43.43.15.1.2

Use the power rule $a^{m} a^{n} = a^{m + n}$ to combine exponents.

$1 + 2 \tan^{2} (x) + \frac{\frac{{\sin (x)}^{1 + 3}}{\cos^{3} (x)}}{\cos (x)} + \frac{- \frac{1}{\cos^{3} (x)}}{\cos (x)} = \frac{0}{\cos (x)}$

Step 53.43.43.15.2

Add $1$ and $3$ .

$1 + 2 \tan^{2} (x) + \frac{\frac{\sin^{4} (x)}{\cos^{3} (x)}}{\cos (x)} + \frac{- \frac{1}{\cos^{3} (x)}}{\cos (x)} = \frac{0}{\cos (x)}$

Step 53.43.43.16

Multiply the numerator by the reciprocal of the denominator.

$1 + 2 \tan^{2} (x) + \frac{\sin^{4} (x)}{\cos^{3} (x)} \cdot \frac{1}{\cos (x)} + \frac{- \frac{1}{\cos^{3} (x)}}{\cos (x)} = \frac{0}{\cos (x)}$

Step 53.43.43.17

Combine.

$1 + 2 \tan^{2} (x) + \frac{\sin^{4} (x) \cdot 1}{\cos^{3} (x) \cos (x)} + \frac{- \frac{1}{\cos^{3} (x)}}{\cos (x)} = \frac{0}{\cos (x)}$

Step 53.43.43.18

Multiply $\cos^{3} (x)$ by $\cos (x)$ by adding the exponents.

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Step 53.43.43.18.1

Multiply $\cos^{3} (x)$ by $\cos (x)$ .

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Step 53.43.43.18.1.1

Raise $\cos (x)$ to the power of $1$ .

$1 + 2 \tan^{2} (x) + \frac{\sin^{4} (x) \cdot 1}{\cos^{3} (x) \cos (x)} + \frac{- \frac{1}{\cos^{3} (x)}}{\cos (x)} = \frac{0}{\cos (x)}$

Step 53.43.43.18.1.2

Use the power rule $a^{m} a^{n} = a^{m + n}$ to combine exponents.

$1 + 2 \tan^{2} (x) + \frac{\sin^{4} (x) \cdot 1}{{\cos (x)}^{3 + 1}} + \frac{- \frac{1}{\cos^{3} (x)}}{\cos (x)} = \frac{0}{\cos (x)}$

Step 53.43.43.18.2

Add $3$ and $1$ .

$1 + 2 \tan^{2} (x) + \frac{\sin^{4} (x) \cdot 1}{\cos^{4} (x)} + \frac{- \frac{1}{\cos^{3} (x)}}{\cos (x)} = \frac{0}{\cos (x)}$

Step 53.43.43.19

Multiply $\sin^{4} (x)$ by $1$ .

$1 + 2 \tan^{2} (x) + \frac{\sin^{4} (x)}{\cos^{4} (x)} + \frac{- \frac{1}{\cos^{3} (x)}}{\cos (x)} = \frac{0}{\cos (x)}$

Step 53.43.43.20

Convert from $\frac{\sin^{4} (x)}{\cos^{4} (x)}$ to $\tan^{4} (x)$ .

$1 + 2 \tan^{2} (x) + \tan^{4} (x) + \frac{- \frac{1}{\cos^{3} (x)}}{\cos (x)} = \frac{0}{\cos (x)}$

Step 53.43.43.21

Multiply the numerator by the reciprocal of the denominator.

$1 + 2 \tan^{2} (x) + \tan^{4} (x) - \frac{1}{\cos^{3} (x)} \cdot \frac{1}{\cos (x)} = \frac{0}{\cos (x)}$

Step 53.43.43.22

Convert from $\frac{1}{\cos (x)}$ to $\sec (x)$ .

$1 + 2 \tan^{2} (x) + \tan^{4} (x) - \frac{1}{\cos^{3} (x)} \cdot \sec (x) = \frac{0}{\cos (x)}$

Step 53.43.43.23

Combine $\sec (x)$ and $\frac{1}{\cos^{3} (x)}$ .

$1 + 2 \tan^{2} (x) + \tan^{4} (x) - \frac{\sec (x)}{\cos^{3} (x)} = \frac{0}{\cos (x)}$

Step 53.43.43.24

Factor $\cos (x)$ out of $\cos^{3} (x)$ .

$1 + 2 \tan^{2} (x) + \tan^{4} (x) - \frac{\sec (x)}{\cos (x) \cos^{2} (x)} = \frac{0}{\cos (x)}$

Step 53.43.43.25

Separate fractions.

$1 + 2 \tan^{2} (x) + \tan^{4} (x) - (\frac{1}{\cos^{2} (x)} \cdot \frac{\sec (x)}{\cos (x)}) = \frac{0}{\cos (x)}$

Step 53.43.43.26

Rewrite $\sec (x)$ in terms of sines and cosines.

$1 + 2 \tan^{2} (x) + \tan^{4} (x) - (\frac{1}{\cos^{2} (x)} \cdot \frac{\frac{1}{\cos (x)}}{\cos (x)}) = \frac{0}{\cos (x)}$

Step 53.43.43.27

Rewrite $\frac{\frac{1}{\cos (x)}}{\cos (x)}$ as a product.

$1 + 2 \tan^{2} (x) + \tan^{4} (x) - (\frac{1}{\cos^{2} (x)} \cdot (\frac{1}{\cos (x)} \cdot \frac{1}{\cos (x)})) = \frac{0}{\cos (x)}$

Step 53.43.43.28

Simplify.

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Step 53.43.43.28.1

Convert from $\frac{1}{\cos (x)}$ to $\sec (x)$ .

$1 + 2 \tan^{2} (x) + \tan^{4} (x) - (\frac{1}{\cos^{2} (x)} \cdot (\sec (x) (\frac{1}{\cos (x)}))) = \frac{0}{\cos (x)}$

Step 53.43.43.28.2

Convert from $\frac{1}{\cos (x)}$ to $\sec (x)$ .

$1 + 2 \tan^{2} (x) + \tan^{4} (x) - (\frac{1}{\cos^{2} (x)} \cdot (\sec (x) \sec (x))) = \frac{0}{\cos (x)}$

Step 53.43.43.28.3

Raise $\sec (x)$ to the power of $1$ .

$1 + 2 \tan^{2} (x) + \tan^{4} (x) - (\frac{1}{\cos^{2} (x)} \cdot (\sec (x) \sec (x))) = \frac{0}{\cos (x)}$

Step 53.43.43.28.4

Raise $\sec (x)$ to the power of $1$ .

$1 + 2 \tan^{2} (x) + \tan^{4} (x) - (\frac{1}{\cos^{2} (x)} \cdot (\sec (x) \sec (x))) = \frac{0}{\cos (x)}$

Step 53.43.43.28.5

Use the power rule $a^{m} a^{n} = a^{m + n}$ to combine exponents.

$1 + 2 \tan^{2} (x) + \tan^{4} (x) - (\frac{1}{\cos^{2} (x)} \cdot {\sec (x)}^{1 + 1}) = \frac{0}{\cos (x)}$

Step 53.43.43.28.6

Add $1$ and $1$ .

$1 + 2 \tan^{2} (x) + \tan^{4} (x) - (\frac{1}{\cos^{2} (x)} \cdot \sec^{2} (x)) = \frac{0}{\cos (x)}$

Step 53.43.43.29

Rewrite $1$ as $1^{2}$ .

$1 + 2 \tan^{2} (x) + \tan^{4} (x) - (\frac{1^{2}}{\cos^{2} (x)} \cdot \sec^{2} (x)) = \frac{0}{\cos (x)}$

Step 53.43.43.30

Rewrite $\frac{1^{2}}{\cos^{2} (x)}$ as ${(\frac{1}{\cos (x)})}^{2}$ .

$1 + 2 \tan^{2} (x) + \tan^{4} (x) - ({(\frac{1}{\cos (x)})}^{2} \sec^{2} (x)) = \frac{0}{\cos (x)}$

Step 53.43.43.31

Convert from $\frac{1}{\cos (x)}$ to $\sec (x)$ .

$1 + 2 \tan^{2} (x) + \tan^{4} (x) - (\sec^{2} (x) \sec^{2} (x)) = \frac{0}{\cos (x)}$

Step 53.43.43.32

Multiply $\sec^{2} (x)$ by $\sec^{2} (x)$ by adding the exponents.

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Step 53.43.43.32.1

Use the power rule $a^{m} a^{n} = a^{m + n}$ to combine exponents.

$1 + 2 \tan^{2} (x) + \tan^{4} (x) - {\sec (x)}^{2 + 2} = \frac{0}{\cos (x)}$

Step 53.43.43.32.2

Add $2$ and $2$ .

$1 + 2 \tan^{2} (x) + \tan^{4} (x) - \sec^{4} (x) = \frac{0}{\cos (x)}$

Step 53.43.43.33

Separate fractions.

$1 + 2 \tan^{2} (x) + \tan^{4} (x) - \sec^{4} (x) = \frac{0}{1} \cdot \frac{1}{\cos (x)}$

Step 53.43.43.34

Convert from $\frac{1}{\cos (x)}$ to $\sec (x)$ .

$1 + 2 \tan^{2} (x) + \tan^{4} (x) - \sec^{4} (x) = \frac{0}{1} \cdot \sec (x)$

Step 53.43.43.35

Divide $0$ by $1$ .

$1 + 2 \tan^{2} (x) + \tan^{4} (x) - \sec^{4} (x) = 0 \sec (x)$

Step 53.43.43.36

Multiply $0$ by $\sec (x)$ .

$1 + 2 \tan^{2} (x) + \tan^{4} (x) - \sec^{4} (x) = 0$

Step 53.43.43.37

Replace the $2 \tan^{2} (x)$ with $2 (\sec^{2} (x) - 1)$ based on the $\tan^{2} (x) + 1 = \sec^{2} (x)$ identity.

$1 + 2 (\sec^{2} (x) - 1) + \tan^{4} (x) - \sec^{4} (x) = 0$

Step 53.43.43.38

Simplify each term.

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Step 53.43.43.38.1

Apply the distributive property.

$1 + 2 \sec^{2} (x) + 2 \cdot - 1 + \tan^{4} (x) - \sec^{4} (x) = 0$

Step 53.43.43.38.2

Multiply $2$ by $- 1$ .

$1 + 2 \sec^{2} (x) - 2 + \tan^{4} (x) - \sec^{4} (x) = 0$

Step 53.43.43.39

Subtract $2$ from $1$ .

$2 \sec^{2} (x) - 1 + \tan^{4} (x) - \sec^{4} (x) = 0$

Step 53.43.43.40

Reorder the polynomial.

$\tan^{4} (x) - \sec^{4} (x) + 2 \sec^{2} (x) - 1 = 0$

Step 53.43.43.41

Multiply both sides by $\cos (x)$ .

$(1 + 2 \tan^{2} (x) + \tan^{4} (x) - \sec^{4} (x)) \cos (x) = \frac{0}{\cos (x)} \cos (x)$

Step 53.43.43.42

Simplify.

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Step 53.43.43.42.1

Simplify the left side.

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Step 53.43.43.42.1.1

Simplify $(1 + 2 \tan^{2} (x) + \tan^{4} (x) - \sec^{4} (x)) \cos (x)$ .

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Step 53.43.43.42.1.1.1

Simplify each term.

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Step 53.43.43.42.1.1.1.1

Rewrite $\tan (x)$ in terms of sines and cosines.

$(1 + 2 {(\frac{\sin (x)}{\cos (x)})}^{2} + \tan^{4} (x) - \sec^{4} (x)) \cos (x) = \frac{0}{\cos (x)} \cos (x)$

Step 53.43.43.42.1.1.1.2

Apply the product rule to $\frac{\sin (x)}{\cos (x)}$ .

$(1 + 2 \frac{\sin^{2} (x)}{\cos^{2} (x)} + \tan^{4} (x) - \sec^{4} (x)) \cos (x) = \frac{0}{\cos (x)} \cos (x)$

Step 53.43.43.42.1.1.1.3

Combine $2$ and $\frac{\sin^{2} (x)}{\cos^{2} (x)}$ .

$(1 + \frac{2 \sin^{2} (x)}{\cos^{2} (x)} + \tan^{4} (x) - \sec^{4} (x)) \cos (x) = \frac{0}{\cos (x)} \cos (x)$

Step 53.43.43.42.1.1.1.4

Rewrite $\tan (x)$ in terms of sines and cosines.

$(1 + \frac{2 \sin^{2} (x)}{\cos^{2} (x)} + {(\frac{\sin (x)}{\cos (x)})}^{4} - \sec^{4} (x)) \cos (x) = \frac{0}{\cos (x)} \cos (x)$

Step 53.43.43.42.1.1.1.5

Apply the product rule to $\frac{\sin (x)}{\cos (x)}$ .

$(1 + \frac{2 \sin^{2} (x)}{\cos^{2} (x)} + \frac{\sin^{4} (x)}{\cos^{4} (x)} - \sec^{4} (x)) \cos (x) = \frac{0}{\cos (x)} \cos (x)$

Step 53.43.43.42.1.1.1.6

Rewrite $\sec (x)$ in terms of sines and cosines.

$(1 + \frac{2 \sin^{2} (x)}{\cos^{2} (x)} + \frac{\sin^{4} (x)}{\cos^{4} (x)} - {(\frac{1}{\cos (x)})}^{4}) \cos (x) = \frac{0}{\cos (x)} \cos (x)$

Step 53.43.43.42.1.1.1.7

Apply the product rule to $\frac{1}{\cos (x)}$ .

$(1 + \frac{2 \sin^{2} (x)}{\cos^{2} (x)} + \frac{\sin^{4} (x)}{\cos^{4} (x)} - \frac{1^{4}}{\cos^{4} (x)}) \cos (x) = \frac{0}{\cos (x)} \cos (x)$

Step 53.43.43.42.1.1.1.8

One to any power is one.

$(1 + \frac{2 \sin^{2} (x)}{\cos^{2} (x)} + \frac{\sin^{4} (x)}{\cos^{4} (x)} - \frac{1}{\cos^{4} (x)}) \cos (x) = \frac{0}{\cos (x)} \cos (x)$

Step 53.43.43.42.1.1.2

Apply the distributive property.

$1 \cos (x) + \frac{2 \sin^{2} (x)}{\cos^{2} (x)} \cos (x) + \frac{\sin^{4} (x)}{\cos^{4} (x)} \cos (x) - \frac{1}{\cos^{4} (x)} \cos (x) = \frac{0}{\cos (x)} \cos (x)$

Step 53.43.43.42.1.1.3

Simplify.

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Step 53.43.43.42.1.1.3.1

Multiply $\cos (x)$ by $1$ .

$\cos (x) + \frac{2 \sin^{2} (x)}{\cos^{2} (x)} \cos (x) + \frac{\sin^{4} (x)}{\cos^{4} (x)} \cos (x) - \frac{1}{\cos^{4} (x)} \cos (x) = \frac{0}{\cos (x)} \cos (x)$

Step 53.43.43.42.1.1.3.2

Cancel the common factor of $\cos (x)$ .

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Step 53.43.43.42.1.1.3.2.1

Factor $\cos (x)$ out of $\cos^{2} (x)$ .

$\cos (x) + \frac{2 \sin^{2} (x)}{\cos (x) \cos (x)} \cos (x) + \frac{\sin^{4} (x)}{\cos^{4} (x)} \cos (x) - \frac{1}{\cos^{4} (x)} \cos (x) = \frac{0}{\cos (x)} \cos (x)$

Step 53.43.43.42.1.1.3.2.2

Cancel the common factor.

$\cos (x) + \frac{2 \sin^{2} (x)}{\cos (x) \cos (x)} \cos (x) + \frac{\sin^{4} (x)}{\cos^{4} (x)} \cos (x) - \frac{1}{\cos^{4} (x)} \cos (x) = \frac{0}{\cos (x)} \cos (x)$

Step 53.43.43.42.1.1.3.2.3

Rewrite the expression.

$\cos (x) + \frac{2 \sin^{2} (x)}{\cos (x)} + \frac{\sin^{4} (x)}{\cos^{4} (x)} \cos (x) - \frac{1}{\cos^{4} (x)} \cos (x) = \frac{0}{\cos (x)} \cos (x)$

Step 53.43.43.42.1.1.3.3

Cancel the common factor of $\cos (x)$ .

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Step 53.43.43.42.1.1.3.3.1

Factor $\cos (x)$ out of $\cos^{4} (x)$ .

$\cos (x) + \frac{2 \sin^{2} (x)}{\cos (x)} + \frac{\sin^{4} (x)}{\cos (x) \cos^{3} (x)} \cos (x) - \frac{1}{\cos^{4} (x)} \cos (x) = \frac{0}{\cos (x)} \cos (x)$

Step 53.43.43.42.1.1.3.3.2

Cancel the common factor.

$\cos (x) + \frac{2 \sin^{2} (x)}{\cos (x)} + \frac{\sin^{4} (x)}{\cos (x) \cos^{3} (x)} \cos (x) - \frac{1}{\cos^{4} (x)} \cos (x) = \frac{0}{\cos (x)} \cos (x)$

Step 53.43.43.42.1.1.3.3.3

Rewrite the expression.

$\cos (x) + \frac{2 \sin^{2} (x)}{\cos (x)} + \frac{\sin^{4} (x)}{\cos^{3} (x)} - \frac{1}{\cos^{4} (x)} \cos (x) = \frac{0}{\cos (x)} \cos (x)$

Step 53.43.43.42.1.1.3.4

Cancel the common factor of $\cos (x)$ .

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Step 53.43.43.42.1.1.3.4.1

Move the leading negative in $- \frac{1}{\cos^{4} (x)}$ into the numerator.

$\cos (x) + \frac{2 \sin^{2} (x)}{\cos (x)} + \frac{\sin^{4} (x)}{\cos^{3} (x)} + \frac{- 1}{\cos^{4} (x)} \cos (x) = \frac{0}{\cos (x)} \cos (x)$

Step 53.43.43.42.1.1.3.4.2

Factor $\cos (x)$ out of $\cos^{4} (x)$ .

$\cos (x) + \frac{2 \sin^{2} (x)}{\cos (x)} + \frac{\sin^{4} (x)}{\cos^{3} (x)} + \frac{- 1}{\cos (x) \cos^{3} (x)} \cos (x) = \frac{0}{\cos (x)} \cos (x)$

Step 53.43.43.42.1.1.3.4.3

Cancel the common factor.

$\cos (x) + \frac{2 \sin^{2} (x)}{\cos (x)} + \frac{\sin^{4} (x)}{\cos^{3} (x)} + \frac{- 1}{\cos (x) \cos^{3} (x)} \cos (x) = \frac{0}{\cos (x)} \cos (x)$

Step 53.43.43.42.1.1.3.4.4

Rewrite the expression.

$\cos (x) + \frac{2 \sin^{2} (x)}{\cos (x)} + \frac{\sin^{4} (x)}{\cos^{3} (x)} + \frac{- 1}{\cos^{3} (x)} = \frac{0}{\cos (x)} \cos (x)$

Step 53.43.43.42.1.1.4

Move the negative in front of the fraction.

$\cos (x) + \frac{2 \sin^{2} (x)}{\cos (x)} + \frac{\sin^{4} (x)}{\cos^{3} (x)} - \frac{1}{\cos^{3} (x)} = \frac{0}{\cos (x)} \cos (x)$

Step 53.43.43.42.1.1.5

Simplify each term.

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Step 53.43.43.42.1.1.5.1

Factor $\sin (x)$ out of $\sin^{2} (x)$ .

$\cos (x) + \frac{2 (\sin (x) \sin (x))}{\cos (x)} + \frac{\sin^{4} (x)}{\cos^{3} (x)} - \frac{1}{\cos^{3} (x)} = \frac{0}{\cos (x)} \cos (x)$

Step 53.43.43.42.1.1.5.2

Separate fractions.

$\cos (x) + \frac{2 (\sin (x))}{1} \cdot \frac{\sin (x)}{\cos (x)} + \frac{\sin^{4} (x)}{\cos^{3} (x)} - \frac{1}{\cos^{3} (x)} = \frac{0}{\cos (x)} \cos (x)$

Step 53.43.43.42.1.1.5.3

Convert from $\frac{\sin (x)}{\cos (x)}$ to $\tan (x)$ .

$\cos (x) + \frac{2 (\sin (x))}{1} \tan (x) + \frac{\sin^{4} (x)}{\cos^{3} (x)} - \frac{1}{\cos^{3} (x)} = \frac{0}{\cos (x)} \cos (x)$

Step 53.43.43.42.1.1.5.4

Divide $2 (\sin (x))$ by $1$ .

$\cos (x) + 2 (\sin (x)) \tan (x) + \frac{\sin^{4} (x)}{\cos^{3} (x)} - \frac{1}{\cos^{3} (x)} = \frac{0}{\cos (x)} \cos (x)$

Step 53.43.43.42.1.1.5.5

Factor $\sin^{3} (x)$ out of $\sin^{4} (x)$ .

$\cos (x) + 2 \sin (x) \tan (x) + \frac{\sin^{3} (x) \sin (x)}{\cos^{3} (x)} - \frac{1}{\cos^{3} (x)} = \frac{0}{\cos (x)} \cos (x)$

Step 53.43.43.42.1.1.5.6

Multiply by $1$ .

$\cos (x) + 2 \sin (x) \tan (x) + \frac{\sin^{3} (x) \sin (x)}{\cos^{3} (x) \cdot 1} - \frac{1}{\cos^{3} (x)} = \frac{0}{\cos (x)} \cos (x)$

Step 53.43.43.42.1.1.5.7

Separate fractions.

$\cos (x) + 2 \sin (x) \tan (x) + \frac{\sin (x)}{1} \cdot \frac{\sin^{3} (x)}{\cos^{3} (x)} - \frac{1}{\cos^{3} (x)} = \frac{0}{\cos (x)} \cos (x)$

Step 53.43.43.42.1.1.5.8

Convert from $\frac{\sin^{3} (x)}{\cos^{3} (x)}$ to $\tan^{3} (x)$ .

$\cos (x) + 2 \sin (x) \tan (x) + \frac{\sin (x)}{1} \tan^{3} (x) - \frac{1}{\cos^{3} (x)} = \frac{0}{\cos (x)} \cos (x)$

Step 53.43.43.42.1.1.5.9

Divide $\sin (x)$ by $1$ .

$\cos (x) + 2 \sin (x) \tan (x) + \sin (x) \tan^{3} (x) - \frac{1}{\cos^{3} (x)} = \frac{0}{\cos (x)} \cos (x)$

Step 53.43.43.42.2

Simplify the right side.

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Step 53.43.43.42.2.1

Cancel the common factor of $\cos (x)$ .

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Step 53.43.43.42.2.1.1

Cancel the common factor.

$\cos (x) + 2 \sin (x) \tan (x) + \sin (x) \tan^{3} (x) - \frac{1}{\cos^{3} (x)} = \frac{0}{\cos (x)} \cos (x)$

Step 53.43.43.42.2.1.2

Rewrite the expression.

$\cos (x) + 2 \sin (x) \tan (x) + \sin (x) \tan^{3} (x) - \frac{1}{\cos^{3} (x)} = 0$

Step 53.43.43.43

Solve for $x$ .

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Step 53.43.43.43.1

Divide each term in the equation by $\cos (x)$ .

$\frac{\cos (x)}{\cos (x)} + \frac{2 \sin (x) \tan (x)}{\cos (x)} + \frac{\sin (x) \tan^{3} (x)}{\cos (x)} + \frac{- \frac{1}{\cos^{3} (x)}}{\cos (x)} = \frac{0}{\cos (x)}$

Step 53.43.43.43.2

Cancel the common factor of $\cos (x)$ .

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Step 53.43.43.43.2.1

Cancel the common factor.

$\frac{\cos (x)}{\cos (x)} + \frac{2 \sin (x) \tan (x)}{\cos (x)} + \frac{\sin (x) \tan^{3} (x)}{\cos (x)} + \frac{- \frac{1}{\cos^{3} (x)}}{\cos (x)} = \frac{0}{\cos (x)}$

Step 53.43.43.43.2.2

Rewrite the expression.

$1 + \frac{2 \sin (x) \tan (x)}{\cos (x)} + \frac{\sin (x) \tan^{3} (x)}{\cos (x)} + \frac{- \frac{1}{\cos^{3} (x)}}{\cos (x)} = \frac{0}{\cos (x)}$

Step 53.43.43.43.3

Simplify the numerator.

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Step 53.43.43.43.3.1

Rewrite $\tan (x)$ in terms of sines and cosines.

$1 + \frac{2 \sin (x) (\frac{\sin (x)}{\cos (x)})}{\cos (x)} + \frac{\sin (x) \tan^{3} (x)}{\cos (x)} + \frac{- \frac{1}{\cos^{3} (x)}}{\cos (x)} = \frac{0}{\cos (x)}$

Step 53.43.43.43.3.2

Combine exponents.

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Step 53.43.43.43.3.2.1

Combine $\frac{\sin (x)}{\cos (x)}$ and $2$ .

$1 + \frac{\frac{\sin (x) \cdot 2}{\cos (x)} \cdot \sin (x)}{\cos (x)} + \frac{\sin (x) \tan^{3} (x)}{\cos (x)} + \frac{- \frac{1}{\cos^{3} (x)}}{\cos (x)} = \frac{0}{\cos (x)}$

Step 53.43.43.43.3.2.2

Combine $\frac{\sin (x) \cdot 2}{\cos (x)}$ and $\sin (x)$ .

$1 + \frac{\frac{\sin (x) \cdot (2 \sin (x))}{\cos (x)}}{\cos (x)} + \frac{\sin (x) \tan^{3} (x)}{\cos (x)} + \frac{- \frac{1}{\cos^{3} (x)}}{\cos (x)} = \frac{0}{\cos (x)}$

Step 53.43.43.43.3.2.3

Raise $\sin (x)$ to the power of $1$ .

$1 + \frac{\frac{2 (\sin (x) \sin (x))}{\cos (x)}}{\cos (x)} + \frac{\sin (x) \tan^{3} (x)}{\cos (x)} + \frac{- \frac{1}{\cos^{3} (x)}}{\cos (x)} = \frac{0}{\cos (x)}$

Step 53.43.43.43.3.2.4

Raise $\sin (x)$ to the power of $1$ .

$1 + \frac{\frac{2 (\sin (x) \sin (x))}{\cos (x)}}{\cos (x)} + \frac{\sin (x) \tan^{3} (x)}{\cos (x)} + \frac{- \frac{1}{\cos^{3} (x)}}{\cos (x)} = \frac{0}{\cos (x)}$

Step 53.43.43.43.3.2.5

Use the power rule $a^{m} a^{n} = a^{m + n}$ to combine exponents.

$1 + \frac{\frac{2 {\sin (x)}^{1 + 1}}{\cos (x)}}{\cos (x)} + \frac{\sin (x) \tan^{3} (x)}{\cos (x)} + \frac{- \frac{1}{\cos^{3} (x)}}{\cos (x)} = \frac{0}{\cos (x)}$

Step 53.43.43.43.3.2.6

Add $1$ and $1$ .

$1 + \frac{\frac{2 \sin^{2} (x)}{\cos (x)}}{\cos (x)} + \frac{\sin (x) \tan^{3} (x)}{\cos (x)} + \frac{- \frac{1}{\cos^{3} (x)}}{\cos (x)} = \frac{0}{\cos (x)}$

Step 53.43.43.43.4

Multiply the numerator by the reciprocal of the denominator.

$1 + \frac{2 \sin^{2} (x)}{\cos (x)} \cdot \frac{1}{\cos (x)} + \frac{\sin (x) \tan^{3} (x)}{\cos (x)} + \frac{- \frac{1}{\cos^{3} (x)}}{\cos (x)} = \frac{0}{\cos (x)}$

Step 53.43.43.43.5

Combine fractions.

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Step 53.43.43.43.5.1

Combine.

$1 + \frac{2 \sin^{2} (x) \cdot 1}{\cos (x) \cos (x)} + \frac{\sin (x) \tan^{3} (x)}{\cos (x)} + \frac{- \frac{1}{\cos^{3} (x)}}{\cos (x)} = \frac{0}{\cos (x)}$

Step 53.43.43.43.5.2

Multiply $2$ by $1$ .

$1 + \frac{2 \sin^{2} (x)}{\cos (x) \cos (x)} + \frac{\sin (x) \tan^{3} (x)}{\cos (x)} + \frac{- \frac{1}{\cos^{3} (x)}}{\cos (x)} = \frac{0}{\cos (x)}$

Step 53.43.43.43.6

Simplify the denominator.

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Step 53.43.43.43.6.1

Use the power rule $a^{m} a^{n} = a^{m + n}$ to combine exponents.

$1 + \frac{2 \sin^{2} (x)}{{\cos (x)}^{1 + 1}} + \frac{\sin (x) \tan^{3} (x)}{\cos (x)} + \frac{- \frac{1}{\cos^{3} (x)}}{\cos (x)} = \frac{0}{\cos (x)}$

Step 53.43.43.43.6.2

Add $1$ and $1$ .

$1 + \frac{2 \sin^{2} (x)}{\cos^{2} (x)} + \frac{\sin (x) \tan^{3} (x)}{\cos (x)} + \frac{- \frac{1}{\cos^{3} (x)}}{\cos (x)} = \frac{0}{\cos (x)}$

Step 53.43.43.43.7

Multiply by $1$ .

$1 + \frac{2 (\sin^{2} (x) \cdot 1)}{\cos^{2} (x)} + \frac{\sin (x) \tan^{3} (x)}{\cos (x)} + \frac{- \frac{1}{\cos^{3} (x)}}{\cos (x)} = \frac{0}{\cos (x)}$

Step 53.43.43.43.8

Multiply by $1$ .

$1 + \frac{2 (\sin^{2} (x) \cdot 1)}{\cos^{2} (x) \cdot 1} + \frac{\sin (x) \tan^{3} (x)}{\cos (x)} + \frac{- \frac{1}{\cos^{3} (x)}}{\cos (x)} = \frac{0}{\cos (x)}$

Step 53.43.43.43.9

Separate fractions.

$1 + \frac{2 \cdot (1)}{1} \cdot \frac{\sin^{2} (x)}{\cos^{2} (x)} + \frac{\sin (x) \tan^{3} (x)}{\cos (x)} + \frac{- \frac{1}{\cos^{3} (x)}}{\cos (x)} = \frac{0}{\cos (x)}$

Step 53.43.43.43.10

Convert from $\frac{\sin^{2} (x)}{\cos^{2} (x)}$ to $\tan^{2} (x)$ .

$1 + \frac{2 \cdot (1)}{1} \cdot \tan^{2} (x) + \frac{\sin (x) \tan^{3} (x)}{\cos (x)} + \frac{- \frac{1}{\cos^{3} (x)}}{\cos (x)} = \frac{0}{\cos (x)}$

Step 53.43.43.43.11

Multiply $2$ by $1$ .

$1 + \frac{2}{1} \cdot \tan^{2} (x) + \frac{\sin (x) \tan^{3} (x)}{\cos (x)} + \frac{- \frac{1}{\cos^{3} (x)}}{\cos (x)} = \frac{0}{\cos (x)}$

Step 53.43.43.43.12

Divide $2$ by $1$ .

$1 + 2 \tan^{2} (x) + \frac{\sin (x) \tan^{3} (x)}{\cos (x)} + \frac{- \frac{1}{\cos^{3} (x)}}{\cos (x)} = \frac{0}{\cos (x)}$

Step 53.43.43.43.13

Simplify the numerator.

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Step 53.43.43.43.13.1

Rewrite $\tan (x)$ in terms of sines and cosines.

$1 + 2 \tan^{2} (x) + \frac{\sin (x) {(\frac{\sin (x)}{\cos (x)})}^{3}}{\cos (x)} + \frac{- \frac{1}{\cos^{3} (x)}}{\cos (x)} = \frac{0}{\cos (x)}$

Step 53.43.43.43.13.2

Apply the product rule to $\frac{\sin (x)}{\cos (x)}$ .

$1 + 2 \tan^{2} (x) + \frac{\sin (x) (\frac{\sin^{3} (x)}{\cos^{3} (x)})}{\cos (x)} + \frac{- \frac{1}{\cos^{3} (x)}}{\cos (x)} = \frac{0}{\cos (x)}$

Step 53.43.43.43.14

Combine $\sin (x)$ and $\frac{\sin^{3} (x)}{\cos^{3} (x)}$ .

$1 + 2 \tan^{2} (x) + \frac{\frac{\sin (x) \sin^{3} (x)}{\cos^{3} (x)}}{\cos (x)} + \frac{- \frac{1}{\cos^{3} (x)}}{\cos (x)} = \frac{0}{\cos (x)}$

Step 53.43.43.43.15

Multiply $\sin (x)$ by $\sin^{3} (x)$ by adding the exponents.

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Step 53.43.43.43.15.1

Multiply $\sin (x)$ by $\sin^{3} (x)$ .

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Step 53.43.43.43.15.1.1

Raise $\sin (x)$ to the power of $1$ .

$1 + 2 \tan^{2} (x) + \frac{\frac{\sin (x) \sin^{3} (x)}{\cos^{3} (x)}}{\cos (x)} + \frac{- \frac{1}{\cos^{3} (x)}}{\cos (x)} = \frac{0}{\cos (x)}$

Step 53.43.43.43.15.1.2

Use the power rule $a^{m} a^{n} = a^{m + n}$ to combine exponents.

$1 + 2 \tan^{2} (x) + \frac{\frac{{\sin (x)}^{1 + 3}}{\cos^{3} (x)}}{\cos (x)} + \frac{- \frac{1}{\cos^{3} (x)}}{\cos (x)} = \frac{0}{\cos (x)}$

Step 53.43.43.43.15.2

Add $1$ and $3$ .

$1 + 2 \tan^{2} (x) + \frac{\frac{\sin^{4} (x)}{\cos^{3} (x)}}{\cos (x)} + \frac{- \frac{1}{\cos^{3} (x)}}{\cos (x)} = \frac{0}{\cos (x)}$

Step 53.43.43.43.16

Multiply the numerator by the reciprocal of the denominator.

$1 + 2 \tan^{2} (x) + \frac{\sin^{4} (x)}{\cos^{3} (x)} \cdot \frac{1}{\cos (x)} + \frac{- \frac{1}{\cos^{3} (x)}}{\cos (x)} = \frac{0}{\cos (x)}$

Step 53.43.43.43.17

Combine.

$1 + 2 \tan^{2} (x) + \frac{\sin^{4} (x) \cdot 1}{\cos^{3} (x) \cos (x)} + \frac{- \frac{1}{\cos^{3} (x)}}{\cos (x)} = \frac{0}{\cos (x)}$

Step 53.43.43.43.18

Multiply $\cos^{3} (x)$ by $\cos (x)$ by adding the exponents.

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Step 53.43.43.43.18.1

Multiply $\cos^{3} (x)$ by $\cos (x)$ .

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Step 53.43.43.43.18.1.1

Raise $\cos (x)$ to the power of $1$ .

$1 + 2 \tan^{2} (x) + \frac{\sin^{4} (x) \cdot 1}{\cos^{3} (x) \cos (x)} + \frac{- \frac{1}{\cos^{3} (x)}}{\cos (x)} = \frac{0}{\cos (x)}$

Step 53.43.43.43.18.1.2

Use the power rule $a^{m} a^{n} = a^{m + n}$ to combine exponents.

$1 + 2 \tan^{2} (x) + \frac{\sin^{4} (x) \cdot 1}{{\cos (x)}^{3 + 1}} + \frac{- \frac{1}{\cos^{3} (x)}}{\cos (x)} = \frac{0}{\cos (x)}$

Step 53.43.43.43.18.2

Add $3$ and $1$ .

$1 + 2 \tan^{2} (x) + \frac{\sin^{4} (x) \cdot 1}{\cos^{4} (x)} + \frac{- \frac{1}{\cos^{3} (x)}}{\cos (x)} = \frac{0}{\cos (x)}$

Step 53.43.43.43.19

Multiply $\sin^{4} (x)$ by $1$ .

$1 + 2 \tan^{2} (x) + \frac{\sin^{4} (x)}{\cos^{4} (x)} + \frac{- \frac{1}{\cos^{3} (x)}}{\cos (x)} = \frac{0}{\cos (x)}$

Step 53.43.43.43.20

Convert from $\frac{\sin^{4} (x)}{\cos^{4} (x)}$ to $\tan^{4} (x)$ .

$1 + 2 \tan^{2} (x) + \tan^{4} (x) + \frac{- \frac{1}{\cos^{3} (x)}}{\cos (x)} = \frac{0}{\cos (x)}$

Step 53.43.43.43.21

Multiply the numerator by the reciprocal of the denominator.

$1 + 2 \tan^{2} (x) + \tan^{4} (x) - \frac{1}{\cos^{3} (x)} \cdot \frac{1}{\cos (x)} = \frac{0}{\cos (x)}$

Step 53.43.43.43.22

Convert from $\frac{1}{\cos (x)}$ to $\sec (x)$ .

$1 + 2 \tan^{2} (x) + \tan^{4} (x) - \frac{1}{\cos^{3} (x)} \cdot \sec (x) = \frac{0}{\cos (x)}$

Step 53.43.43.43.23

Combine $\sec (x)$ and $\frac{1}{\cos^{3} (x)}$ .

$1 + 2 \tan^{2} (x) + \tan^{4} (x) - \frac{\sec (x)}{\cos^{3} (x)} = \frac{0}{\cos (x)}$

Step 53.43.43.43.24

Factor $\cos (x)$ out of $\cos^{3} (x)$ .

$1 + 2 \tan^{2} (x) + \tan^{4} (x) - \frac{\sec (x)}{\cos (x) \cos^{2} (x)} = \frac{0}{\cos (x)}$

Step 53.43.43.43.25

Separate fractions.

$1 + 2 \tan^{2} (x) + \tan^{4} (x) - (\frac{1}{\cos^{2} (x)} \cdot \frac{\sec (x)}{\cos (x)}) = \frac{0}{\cos (x)}$

Step 53.43.43.43.26

Rewrite $\sec (x)$ in terms of sines and cosines.

$1 + 2 \tan^{2} (x) + \tan^{4} (x) - (\frac{1}{\cos^{2} (x)} \cdot \frac{\frac{1}{\cos (x)}}{\cos (x)}) = \frac{0}{\cos (x)}$

Step 53.43.43.43.27

Rewrite $\frac{\frac{1}{\cos (x)}}{\cos (x)}$ as a product.

$1 + 2 \tan^{2} (x) + \tan^{4} (x) - (\frac{1}{\cos^{2} (x)} \cdot (\frac{1}{\cos (x)} \cdot \frac{1}{\cos (x)})) = \frac{0}{\cos (x)}$

Step 53.43.43.43.28

Simplify.

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Step 53.43.43.43.28.1

Convert from $\frac{1}{\cos (x)}$ to $\sec (x)$ .

$1 + 2 \tan^{2} (x) + \tan^{4} (x) - (\frac{1}{\cos^{2} (x)} \cdot (\sec (x) (\frac{1}{\cos (x)}))) = \frac{0}{\cos (x)}$

Step 53.43.43.43.28.2

Convert from $\frac{1}{\cos (x)}$ to $\sec (x)$ .

$1 + 2 \tan^{2} (x) + \tan^{4} (x) - (\frac{1}{\cos^{2} (x)} \cdot (\sec (x) \sec (x))) = \frac{0}{\cos (x)}$

Step 53.43.43.43.28.3

Raise $\sec (x)$ to the power of $1$ .

$1 + 2 \tan^{2} (x) + \tan^{4} (x) - (\frac{1}{\cos^{2} (x)} \cdot (\sec (x) \sec (x))) = \frac{0}{\cos (x)}$

Step 53.43.43.43.28.4

Raise $\sec (x)$ to the power of $1$ .

$1 + 2 \tan^{2} (x) + \tan^{4} (x) - (\frac{1}{\cos^{2} (x)} \cdot (\sec (x) \sec (x))) = \frac{0}{\cos (x)}$

Step 53.43.43.43.28.5

Use the power rule $a^{m} a^{n} = a^{m + n}$ to combine exponents.

$1 + 2 \tan^{2} (x) + \tan^{4} (x) - (\frac{1}{\cos^{2} (x)} \cdot {\sec (x)}^{1 + 1}) = \frac{0}{\cos (x)}$

Step 53.43.43.43.28.6

Add $1$ and $1$ .

$1 + 2 \tan^{2} (x) + \tan^{4} (x) - (\frac{1}{\cos^{2} (x)} \cdot \sec^{2} (x)) = \frac{0}{\cos (x)}$

Step 53.43.43.43.29

Rewrite $1$ as $1^{2}$ .

$1 + 2 \tan^{2} (x) + \tan^{4} (x) - (\frac{1^{2}}{\cos^{2} (x)} \cdot \sec^{2} (x)) = \frac{0}{\cos (x)}$

Step 53.43.43.43.30

Rewrite $\frac{1^{2}}{\cos^{2} (x)}$ as ${(\frac{1}{\cos (x)})}^{2}$ .

$1 + 2 \tan^{2} (x) + \tan^{4} (x) - ({(\frac{1}{\cos (x)})}^{2} \sec^{2} (x)) = \frac{0}{\cos (x)}$

Step 53.43.43.43.31

Convert from $\frac{1}{\cos (x)}$ to $\sec (x)$ .

$1 + 2 \tan^{2} (x) + \tan^{4} (x) - (\sec^{2} (x) \sec^{2} (x)) = \frac{0}{\cos (x)}$

Step 53.43.43.43.32

Multiply $\sec^{2} (x)$ by $\sec^{2} (x)$ by adding the exponents.

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Step 53.43.43.43.32.1

Use the power rule $a^{m} a^{n} = a^{m + n}$ to combine exponents.

$1 + 2 \tan^{2} (x) + \tan^{4} (x) - {\sec (x)}^{2 + 2} = \frac{0}{\cos (x)}$

Step 53.43.43.43.32.2

Add $2$ and $2$ .

$1 + 2 \tan^{2} (x) + \tan^{4} (x) - \sec^{4} (x) = \frac{0}{\cos (x)}$

Step 53.43.43.43.33

Separate fractions.

$1 + 2 \tan^{2} (x) + \tan^{4} (x) - \sec^{4} (x) = \frac{0}{1} \cdot \frac{1}{\cos (x)}$

Step 53.43.43.43.34

Convert from $\frac{1}{\cos (x)}$ to $\sec (x)$ .

$1 + 2 \tan^{2} (x) + \tan^{4} (x) - \sec^{4} (x) = \frac{0}{1} \cdot \sec (x)$

Step 53.43.43.43.35

Divide $0$ by $1$ .

$1 + 2 \tan^{2} (x) + \tan^{4} (x) - \sec^{4} (x) = 0 \sec (x)$

Step 53.43.43.43.36

Multiply $0$ by $\sec (x)$ .

$1 + 2 \tan^{2} (x) + \tan^{4} (x) - \sec^{4} (x) = 0$

Step 53.43.43.43.37

Simplify the left side.

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Step 53.43.43.43.37.1

Simplify $1 + 2 \tan^{2} (x) + \tan^{4} (x) - \sec^{4} (x)$ .

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Step 53.43.43.43.37.1.1

Factor using the perfect square rule.

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Step 53.43.43.43.37.1.1.1

Rewrite $1$ as $1^{2}$ .

$1^{2} + 2 \tan^{2} (x) + \tan^{4} (x) - \sec^{4} (x) = 0$

Step 53.43.43.43.37.1.1.2

Rewrite $\tan^{4} (x)$ as ${(\tan^{2} (x))}^{2}$ .

$1^{2} + 2 \tan^{2} (x) + {(\tan^{2} (x))}^{2} - \sec^{4} (x) = 0$

Step 53.43.43.43.37.1.1.3

Check that the middle term is two times the product of the numbers being squared in the first term and third term.

$2 \tan^{2} (x) = 2 \cdot 1 \cdot \tan^{2} (x)$

Step 53.43.43.43.37.1.1.4

Rewrite the polynomial.

$1^{2} + 2 \cdot 1 \cdot \tan^{2} (x) + {(\tan^{2} (x))}^{2} - \sec^{4} (x) = 0$

Step 53.43.43.43.37.1.1.5

Factor using the perfect square trinomial rule $a^{2} + 2 a b + b^{2} = {(a + b)}^{2}$ , where $a = 1$ and $b = \tan^{2} (x)$ .

${(1 + \tan^{2} (x))}^{2} - \sec^{4} (x) = 0$

Step 53.43.43.43.37.1.2

Rewrite $\sec^{4} (x)$ as ${(\sec^{2} (x))}^{2}$ .

${(1 + \tan^{2} (x))}^{2} - {(\sec^{2} (x))}^{2} = 0$

Step 53.43.43.43.37.1.3

Since both terms are perfect squares, factor using the difference of squares formula, $a^{2} - b^{2} = (a + b) (a - b)$ where $a = 1 + \tan^{2} (x)$ and $b = \sec^{2} (x)$ .

$(1 + \tan^{2} (x) + \sec^{2} (x)) (1 + \tan^{2} (x) - \sec^{2} (x)) = 0$

Step 53.43.43.43.37.1.4

Rearrange terms.

$(\tan^{2} (x) + 1 + \sec^{2} (x)) (1 + \tan^{2} (x) - \sec^{2} (x)) = 0$

Step 53.43.43.43.37.1.5

Apply pythagorean identity.

$(\sec^{2} (x) + \sec^{2} (x)) (1 + \tan^{2} (x) - \sec^{2} (x)) = 0$

Step 53.43.43.43.37.1.6

Add $\sec^{2} (x)$ and $\sec^{2} (x)$ .

$2 \sec^{2} (x) (1 + \tan^{2} (x) - \sec^{2} (x)) = 0$

Step 53.43.43.43.37.1.7

Rearrange terms.

$2 \sec^{2} (x) (\tan^{2} (x) + 1 - \sec^{2} (x)) = 0$

Step 53.43.43.43.37.1.8

Apply pythagorean identity.

$2 \sec^{2} (x) (\sec^{2} (x) - \sec^{2} (x)) = 0$

Step 53.43.43.43.37.1.9

Subtract $\sec^{2} (x)$ from $\sec^{2} (x)$ .

$2 \sec^{2} (x) \cdot 0 = 0$

Step 53.43.43.43.37.1.10

Multiply $2 \sec^{2} (x) \cdot 0$ .

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Step 53.43.43.43.37.1.10.1

Multiply $0$ by $2$ .

$0 \sec^{2} (x) = 0$

Step 53.43.43.43.37.1.10.2

Multiply $0$ by $\sec^{2} (x)$ .

$0 = 0$

Step 53.43.43.43.38

Since $0 = 0$ , the equation will always be true for any value of $x$ .

All real numbers

Step 54

The result can be shown in multiple forms.

All real numbers

Interval Notation:

$(- \infty, \infty)$