Calculus Examples

$y = \frac{1}{12} \cdot ((\sec^{2} (3 x)) (\tan^{2} (3 x) - 1))$

Step 1

Rewrite the right side with rational exponents.

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Step 1.1

Multiply $\sec^{2} (3 x)$ by $\tan^{2} (3 x) - 1$ .

$y = \frac{1}{12} \cdot (\sec^{2} (3 x) (\tan^{2} (3 x) - 1))$

Step 1.2

Remove parentheses.

$y = \frac{1}{12} \cdot (\sec^{2} (3 x) (\tan^{2} (3 x) - 1))$

Step 2

Differentiate both sides of the equation.

$\frac{d}{d x} (y) = \frac{d}{d x} (\frac{1}{12} \cdot (\sec^{2} (3 x) (\tan^{2} (3 x) - 1)))$

Step 3

The derivative of $y$ with respect to $x$ is $y'$ .

$y'$

Step 4

Differentiate the right side of the equation.

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Step 4.1

Combine $\sec^{2} (3 x)$ and $\frac{1}{12}$ .

$\frac{d}{d x} [\frac{\sec^{2} (3 x)}{12} \cdot (\tan^{2} (3 x) - 1)]$

Step 4.2

Differentiate using the Product Rule which states that $\frac{d}{d x} [f (x) g (x)]$ is $f (x) \frac{d}{d x} [g (x)] + g (x) \frac{d}{d x} [f (x)]$ where $f (x) = \frac{\sec^{2} (3 x)}{12}$ and $g (x) = \tan^{2} (3 x) - 1$ .

$\frac{\sec^{2} (3 x)}{12} \frac{d}{d x} [\tan^{2} (3 x) - 1] + (\tan^{2} (3 x) - 1) \frac{d}{d x} [\frac{\sec^{2} (3 x)}{12}]$

Step 4.3

By the Sum Rule, the derivative of $\tan^{2} (3 x) - 1$ with respect to $x$ is $\frac{d}{d x} [\tan^{2} (3 x)] + \frac{d}{d x} [- 1]$ .

$\frac{\sec^{2} (3 x)}{12} (\frac{d}{d x} [\tan^{2} (3 x)] + \frac{d}{d x} [- 1]) + (\tan^{2} (3 x) - 1) \frac{d}{d x} [\frac{\sec^{2} (3 x)}{12}]$

Step 4.4

Differentiate using the chain rule, which states that $\frac{d}{d x} [f (g (x))]$ is $f' (g (x)) g' (x)$ where $f (x) = x^{2}$ and $g (x) = \tan (3 x)$ .

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Step 4.4.1

To apply the Chain Rule, set $u_{1}$ as $\tan (3 x)$ .

$\frac{\sec^{2} (3 x)}{12} (\frac{d}{d u_{1}} [{u_{1}}^{2}] \frac{d}{d x} [\tan (3 x)] + \frac{d}{d x} [- 1]) + (\tan^{2} (3 x) - 1) \frac{d}{d x} [\frac{\sec^{2} (3 x)}{12}]$

Step 4.4.2

Differentiate using the Power Rule which states that $\frac{d}{d u_{1}} [{u_{1}}^{n}]$ is $n {u_{1}}^{n - 1}$ where $n = 2$ .

$\frac{\sec^{2} (3 x)}{12} (2 u_{1} \frac{d}{d x} [\tan (3 x)] + \frac{d}{d x} [- 1]) + (\tan^{2} (3 x) - 1) \frac{d}{d x} [\frac{\sec^{2} (3 x)}{12}]$

Step 4.4.3

Replace all occurrences of $u_{1}$ with $\tan (3 x)$ .

$\frac{\sec^{2} (3 x)}{12} (2 \tan (3 x) \frac{d}{d x} [\tan (3 x)] + \frac{d}{d x} [- 1]) + (\tan^{2} (3 x) - 1) \frac{d}{d x} [\frac{\sec^{2} (3 x)}{12}]$

Step 4.5

Differentiate using the chain rule, which states that $\frac{d}{d x} [f (g (x))]$ is $f' (g (x)) g' (x)$ where $f (x) = \tan (x)$ and $g (x) = 3 x$ .

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Step 4.5.1

To apply the Chain Rule, set $u_{2}$ as $3 x$ .

$\frac{\sec^{2} (3 x)}{12} (2 \tan (3 x) (\frac{d}{d u_{2}} [\tan (u_{2})] \frac{d}{d x} [3 x]) + \frac{d}{d x} [- 1]) + (\tan^{2} (3 x) - 1) \frac{d}{d x} [\frac{\sec^{2} (3 x)}{12}]$

Step 4.5.2

The derivative of $\tan (u_{2})$ with respect to $u_{2}$ is $\sec^{2} (u_{2})$ .

$\frac{\sec^{2} (3 x)}{12} (2 \tan (3 x) (\sec^{2} (u_{2}) \frac{d}{d x} [3 x]) + \frac{d}{d x} [- 1]) + (\tan^{2} (3 x) - 1) \frac{d}{d x} [\frac{\sec^{2} (3 x)}{12}]$

Step 4.5.3

Replace all occurrences of $u_{2}$ with $3 x$ .

$\frac{\sec^{2} (3 x)}{12} (2 \tan (3 x) (\sec^{2} (3 x) \frac{d}{d x} [3 x]) + \frac{d}{d x} [- 1]) + (\tan^{2} (3 x) - 1) \frac{d}{d x} [\frac{\sec^{2} (3 x)}{12}]$

Step 4.6

Differentiate.

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Step 4.6.1

Since $3$ is constant with respect to $x$ , the derivative of $3 x$ with respect to $x$ is $3 \frac{d}{d x} [x]$ .

$\frac{\sec^{2} (3 x)}{12} (2 \tan (3 x) \sec^{2} (3 x) (3 \frac{d}{d x} [x]) + \frac{d}{d x} [- 1]) + (\tan^{2} (3 x) - 1) \frac{d}{d x} [\frac{\sec^{2} (3 x)}{12}]$

Step 4.6.2

Multiply $3$ by $2$ .

$\frac{\sec^{2} (3 x)}{12} (6 \tan (3 x) \sec^{2} (3 x) \frac{d}{d x} [x] + \frac{d}{d x} [- 1]) + (\tan^{2} (3 x) - 1) \frac{d}{d x} [\frac{\sec^{2} (3 x)}{12}]$

Step 4.6.3

Differentiate using the Power Rule which states that $\frac{d}{d x} [x^{n}]$ is $n x^{n - 1}$ where $n = 1$ .

$\frac{\sec^{2} (3 x)}{12} (6 \tan (3 x) \sec^{2} (3 x) \cdot 1 + \frac{d}{d x} [- 1]) + (\tan^{2} (3 x) - 1) \frac{d}{d x} [\frac{\sec^{2} (3 x)}{12}]$

Step 4.6.4

Multiply $6$ by $1$ .

$\frac{\sec^{2} (3 x)}{12} (6 \tan (3 x) \sec^{2} (3 x) + \frac{d}{d x} [- 1]) + (\tan^{2} (3 x) - 1) \frac{d}{d x} [\frac{\sec^{2} (3 x)}{12}]$

Step 4.6.5

Since $- 1$ is constant with respect to $x$ , the derivative of $- 1$ with respect to $x$ is $0$ .

$\frac{\sec^{2} (3 x)}{12} (6 \tan (3 x) \sec^{2} (3 x) + 0) + (\tan^{2} (3 x) - 1) \frac{d}{d x} [\frac{\sec^{2} (3 x)}{12}]$

Step 4.6.6

Combine fractions.

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Step 4.6.6.1

Add $6 \tan (3 x) \sec^{2} (3 x)$ and $0$ .

$\frac{\sec^{2} (3 x)}{12} (6 \tan (3 x) \sec^{2} (3 x)) + (\tan^{2} (3 x) - 1) \frac{d}{d x} [\frac{\sec^{2} (3 x)}{12}]$

Step 4.6.6.2

Combine $6$ and $\frac{\sec^{2} (3 x)}{12}$ .

$\frac{6 \sec^{2} (3 x)}{12} (\tan (3 x) \sec^{2} (3 x)) + (\tan^{2} (3 x) - 1) \frac{d}{d x} [\frac{\sec^{2} (3 x)}{12}]$

Step 4.6.6.3

Combine $\tan (3 x)$ and $\frac{6 \sec^{2} (3 x)}{12}$ .

$\frac{\tan (3 x) (6 \sec^{2} (3 x))}{12} \sec^{2} (3 x) + (\tan^{2} (3 x) - 1) \frac{d}{d x} [\frac{\sec^{2} (3 x)}{12}]$

Step 4.6.6.4

Combine $\frac{\tan (3 x) (6 \sec^{2} (3 x))}{12}$ and $\sec^{2} (3 x)$ .

$\frac{\tan (3 x) (6 \sec^{2} (3 x)) \sec^{2} (3 x)}{12} + (\tan^{2} (3 x) - 1) \frac{d}{d x} [\frac{\sec^{2} (3 x)}{12}]$

Step 4.7

Multiply $\sec^{2} (3 x)$ by $\sec^{2} (3 x)$ by adding the exponents.

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Step 4.7.1

Move $\sec^{2} (3 x)$ .

$\frac{\tan (3 x) (6 (\sec^{2} (3 x) \sec^{2} (3 x)))}{12} + (\tan^{2} (3 x) - 1) \frac{d}{d x} [\frac{\sec^{2} (3 x)}{12}]$

Step 4.7.2

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

$\frac{\tan (3 x) (6 {\sec (3 x)}^{2 + 2})}{12} + (\tan^{2} (3 x) - 1) \frac{d}{d x} [\frac{\sec^{2} (3 x)}{12}]$

Step 4.7.3

Add $2$ and $2$ .

$\frac{\tan (3 x) (6 \sec^{4} (3 x))}{12} + (\tan^{2} (3 x) - 1) \frac{d}{d x} [\frac{\sec^{2} (3 x)}{12}]$

Step 4.8

Differentiate using the Constant Multiple Rule.

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Step 4.8.1

Move $6$ to the left of $\tan (3 x)$ .

$\frac{6 \cdot \tan (3 x) \sec^{4} (3 x)}{12} + (\tan^{2} (3 x) - 1) \frac{d}{d x} [\frac{\sec^{2} (3 x)}{12}]$

Step 4.8.2

Cancel the common factor of $6$ and $12$ .

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Step 4.8.2.1

Factor $6$ out of $6 \tan (3 x) \sec^{4} (3 x)$ .

$\frac{6 (\tan (3 x) \sec^{4} (3 x))}{12} + (\tan^{2} (3 x) - 1) \frac{d}{d x} [\frac{\sec^{2} (3 x)}{12}]$

Step 4.8.2.2

Cancel the common factors.

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Step 4.8.2.2.1

Factor $6$ out of $12$ .

$\frac{6 (\tan (3 x) \sec^{4} (3 x))}{6 \cdot 2} + (\tan^{2} (3 x) - 1) \frac{d}{d x} [\frac{\sec^{2} (3 x)}{12}]$

Step 4.8.2.2.2

Cancel the common factor.

$\frac{6 (\tan (3 x) \sec^{4} (3 x))}{6 \cdot 2} + (\tan^{2} (3 x) - 1) \frac{d}{d x} [\frac{\sec^{2} (3 x)}{12}]$

Step 4.8.2.2.3

Rewrite the expression.

$\frac{\tan (3 x) \sec^{4} (3 x)}{2} + (\tan^{2} (3 x) - 1) \frac{d}{d x} [\frac{\sec^{2} (3 x)}{12}]$

Step 4.8.3

Since $\frac{1}{12}$ is constant with respect to $x$ , the derivative of $\frac{\sec^{2} (3 x)}{12}$ with respect to $x$ is $\frac{1}{12} \frac{d}{d x} [\sec^{2} (3 x)]$ .

$\frac{\tan (3 x) \sec^{4} (3 x)}{2} + (\tan^{2} (3 x) - 1) (\frac{1}{12} \frac{d}{d x} [\sec^{2} (3 x)])$

Step 4.9

Differentiate using the chain rule, which states that $\frac{d}{d x} [f (g (x))]$ is $f' (g (x)) g' (x)$ where $f (x) = x^{2}$ and $g (x) = \sec (3 x)$ .

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Step 4.9.1

To apply the Chain Rule, set $u_{3}$ as $\sec (3 x)$ .

$\frac{\tan (3 x) \sec^{4} (3 x)}{2} + (\tan^{2} (3 x) - 1) \frac{1}{12} (\frac{d}{d u_{3}} [{u_{3}}^{2}] \frac{d}{d x} [\sec (3 x)])$

Step 4.9.2

Differentiate using the Power Rule which states that $\frac{d}{d u_{3}} [{u_{3}}^{n}]$ is $n {u_{3}}^{n - 1}$ where $n = 2$ .

$\frac{\tan (3 x) \sec^{4} (3 x)}{2} + (\tan^{2} (3 x) - 1) \frac{1}{12} (2 u_{3} \frac{d}{d x} [\sec (3 x)])$

Step 4.9.3

Replace all occurrences of $u_{3}$ with $\sec (3 x)$ .

$\frac{\tan (3 x) \sec^{4} (3 x)}{2} + (\tan^{2} (3 x) - 1) \frac{1}{12} (2 \sec (3 x) \frac{d}{d x} [\sec (3 x)])$

Step 4.10

Simplify terms.

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Step 4.10.1

Combine $2$ and $\frac{1}{12}$ .

$\frac{\tan (3 x) \sec^{4} (3 x)}{2} + (\tan^{2} (3 x) - 1) \frac{2}{12} (\sec (3 x) \frac{d}{d x} [\sec (3 x)])$

Step 4.10.2

Combine $\sec (3 x)$ and $\frac{2}{12}$ .

$\frac{\tan (3 x) \sec^{4} (3 x)}{2} + (\tan^{2} (3 x) - 1) \frac{\sec (3 x) \cdot 2}{12} \frac{d}{d x} [\sec (3 x)]$

Step 4.10.3

Move $2$ to the left of $\sec (3 x)$ .

$\frac{\tan (3 x) \sec^{4} (3 x)}{2} + (\tan^{2} (3 x) - 1) \frac{2 \cdot \sec (3 x)}{12} \frac{d}{d x} [\sec (3 x)]$

Step 4.10.4

Cancel the common factor of $2$ and $12$ .

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Step 4.10.4.1

Factor $2$ out of $2 \sec (3 x)$ .

$\frac{\tan (3 x) \sec^{4} (3 x)}{2} + (\tan^{2} (3 x) - 1) \frac{2 (\sec (3 x))}{12} \frac{d}{d x} [\sec (3 x)]$

Step 4.10.4.2

Cancel the common factors.

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Step 4.10.4.2.1

Factor $2$ out of $12$ .

$\frac{\tan (3 x) \sec^{4} (3 x)}{2} + (\tan^{2} (3 x) - 1) \frac{2 \sec (3 x)}{2 \cdot 6} \frac{d}{d x} [\sec (3 x)]$

Step 4.10.4.2.2

Cancel the common factor.

$\frac{\tan (3 x) \sec^{4} (3 x)}{2} + (\tan^{2} (3 x) - 1) \frac{2 \sec (3 x)}{2 \cdot 6} \frac{d}{d x} [\sec (3 x)]$

Step 4.10.4.2.3

Rewrite the expression.

$\frac{\tan (3 x) \sec^{4} (3 x)}{2} + (\tan^{2} (3 x) - 1) \frac{\sec (3 x)}{6} \frac{d}{d x} [\sec (3 x)]$

Step 4.11

Differentiate using the chain rule, which states that $\frac{d}{d x} [f (g (x))]$ is $f' (g (x)) g' (x)$ where $f (x) = \sec (x)$ and $g (x) = 3 x$ .

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Step 4.11.1

To apply the Chain Rule, set $u_{4}$ as $3 x$ .

$\frac{\tan (3 x) \sec^{4} (3 x)}{2} + (\tan^{2} (3 x) - 1) \frac{\sec (3 x)}{6} (\frac{d}{d u_{4}} [\sec (u_{4})] \frac{d}{d x} [3 x])$

Step 4.11.2

The derivative of $\sec (u_{4})$ with respect to $u_{4}$ is $\sec (u_{4}) \tan (u_{4})$ .

$\frac{\tan (3 x) \sec^{4} (3 x)}{2} + (\tan^{2} (3 x) - 1) \frac{\sec (3 x)}{6} (\sec (u_{4}) \tan (u_{4}) \frac{d}{d x} [3 x])$

Step 4.11.3

Replace all occurrences of $u_{4}$ with $3 x$ .

$\frac{\tan (3 x) \sec^{4} (3 x)}{2} + (\tan^{2} (3 x) - 1) \frac{\sec (3 x)}{6} (\sec (3 x) \tan (3 x) \frac{d}{d x} [3 x])$

Step 4.12

Combine $\sec (3 x)$ and $\frac{\sec (3 x)}{6}$ .

$\frac{\tan (3 x) \sec^{4} (3 x)}{2} + (\tan^{2} (3 x) - 1) \frac{\sec (3 x) \sec (3 x)}{6} (\tan (3 x) \frac{d}{d x} [3 x])$

Step 4.13

Raise $\sec (3 x)$ to the power of $1$ .

$\frac{\tan (3 x) \sec^{4} (3 x)}{2} + (\tan^{2} (3 x) - 1) \frac{\sec^{1} (3 x) \sec (3 x)}{6} (\tan (3 x) \frac{d}{d x} [3 x])$

Step 4.14

Raise $\sec (3 x)$ to the power of $1$ .

$\frac{\tan (3 x) \sec^{4} (3 x)}{2} + (\tan^{2} (3 x) - 1) \frac{\sec^{1} (3 x) \sec^{1} (3 x)}{6} (\tan (3 x) \frac{d}{d x} [3 x])$

Step 4.15

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

$\frac{\tan (3 x) \sec^{4} (3 x)}{2} + (\tan^{2} (3 x) - 1) \frac{{\sec (3 x)}^{1 + 1}}{6} (\tan (3 x) \frac{d}{d x} [3 x])$

Step 4.16

Combine fractions.

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Step 4.16.1

Add $1$ and $1$ .

$\frac{\tan (3 x) \sec^{4} (3 x)}{2} + (\tan^{2} (3 x) - 1) \frac{\sec^{2} (3 x)}{6} (\tan (3 x) \frac{d}{d x} [3 x])$

Step 4.16.2

Combine $\tan (3 x)$ and $\frac{\sec^{2} (3 x)}{6}$ .

$\frac{\tan (3 x) \sec^{4} (3 x)}{2} + (\tan^{2} (3 x) - 1) \frac{\tan (3 x) \sec^{2} (3 x)}{6} \frac{d}{d x} [3 x]$

Step 4.17

Since $3$ is constant with respect to $x$ , the derivative of $3 x$ with respect to $x$ is $3 \frac{d}{d x} [x]$ .

$\frac{\tan (3 x) \sec^{4} (3 x)}{2} + (\tan^{2} (3 x) - 1) \frac{\tan (3 x) \sec^{2} (3 x)}{6} (3 \frac{d}{d x} [x])$

Step 4.18

Simplify terms.

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Step 4.18.1

Combine $3$ and $\frac{\tan (3 x) \sec^{2} (3 x)}{6}$ .

$\frac{\tan (3 x) \sec^{4} (3 x)}{2} + (\tan^{2} (3 x) - 1) \frac{3 (\tan (3 x) \sec^{2} (3 x))}{6} \frac{d}{d x} [x]$

Step 4.18.2

Cancel the common factors.

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Step 4.18.2.1

Factor $3$ out of $6$ .

$\frac{\tan (3 x) \sec^{4} (3 x)}{2} + (\tan^{2} (3 x) - 1) \frac{3 (\tan (3 x) \sec^{2} (3 x))}{3 \cdot 2} \frac{d}{d x} [x]$

Step 4.18.2.2

Cancel the common factor.

$\frac{\tan (3 x) \sec^{4} (3 x)}{2} + (\tan^{2} (3 x) - 1) \frac{3 (\tan (3 x) \sec^{2} (3 x))}{3 \cdot 2} \frac{d}{d x} [x]$

Step 4.18.2.3

Rewrite the expression.

$\frac{\tan (3 x) \sec^{4} (3 x)}{2} + (\tan^{2} (3 x) - 1) \frac{\tan (3 x) \sec^{2} (3 x)}{2} \frac{d}{d x} [x]$

Step 4.19

Differentiate using the Power Rule which states that $\frac{d}{d x} [x^{n}]$ is $n x^{n - 1}$ where $n = 1$ .

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

Step 4.20

Multiply $\tan^{2} (3 x) - 1$ by $1$ .

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

Step 4.21

To write $(\tan^{2} (3 x) - 1) \frac{\tan (3 x) \sec^{2} (3 x)}{2}$ as a fraction with a common denominator, multiply by $\frac{2}{2}$ .

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

Step 4.22

Combine $(\tan^{2} (3 x) - 1) \frac{\tan (3 x) \sec^{2} (3 x)}{2}$ and $\frac{2}{2}$ .

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

Step 4.23

Combine the numerators over the common denominator.

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

Step 4.24

Combine $2$ and $\frac{\tan (3 x) \sec^{2} (3 x)}{2}$ .

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

Step 4.25

Cancel the common factor of $2$ .

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Step 4.25.1

Cancel the common factor.

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

Step 4.25.2

Divide $\tan (3 x) \sec^{2} (3 x)$ by $1$ .

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

Step 4.26

Simplify.

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Step 4.26.1

Apply the distributive property.

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

Step 4.26.2

Apply the distributive property.

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

Step 4.26.3

Simplify the numerator.

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Step 4.26.3.1

Factor $\tan (3 x) \sec^{2} (3 x)$ out of $\tan (3 x) \sec^{4} (3 x) + \tan^{2} (3 x) \tan (3 x) \sec^{2} (3 x) - 1 \tan (3 x) \sec^{2} (3 x)$ .

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Step 4.26.3.1.1

Factor $\tan (3 x) \sec^{2} (3 x)$ out of $\tan (3 x) \sec^{4} (3 x)$ .

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

Step 4.26.3.1.2

Factor $\tan (3 x) \sec^{2} (3 x)$ out of $\tan^{2} (3 x) \tan (3 x) \sec^{2} (3 x)$ .

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

Step 4.26.3.1.3

Factor $\tan (3 x) \sec^{2} (3 x)$ out of $- 1 \tan (3 x) \sec^{2} (3 x)$ .

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

Step 4.26.3.1.4

Factor $\tan (3 x) \sec^{2} (3 x)$ out of $\tan (3 x) \sec^{2} (3 x) (\sec^{2} (3 x)) + \tan (3 x) \sec^{2} (3 x) (\tan (3 x) \tan (3 x))$ .

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

Step 4.26.3.1.5

Factor $\tan (3 x) \sec^{2} (3 x)$ out of $\tan (3 x) \sec^{2} (3 x) (\sec^{2} (3 x) + \tan (3 x) \tan (3 x)) + \tan (3 x) \sec^{2} (3 x) (- 1)$ .

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

Step 4.26.3.2

Move $- 1$ .

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

Step 4.26.3.3

Apply pythagorean identity.

$\frac{\tan (3 x) \sec^{2} (3 x) (\tan^{2} (3 x) + \tan (3 x) \tan (3 x))}{2}$

Step 4.26.3.4

Multiply $\tan (3 x) \tan (3 x)$ .

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Step 4.26.3.4.1

Raise $\tan (3 x)$ to the power of $1$ .

$\frac{\tan (3 x) \sec^{2} (3 x) (\tan^{2} (3 x) + \tan^{1} (3 x) \tan (3 x))}{2}$

Step 4.26.3.4.2

Raise $\tan (3 x)$ to the power of $1$ .

$\frac{\tan (3 x) \sec^{2} (3 x) (\tan^{2} (3 x) + \tan^{1} (3 x) \tan^{1} (3 x))}{2}$

Step 4.26.3.4.3

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

$\frac{\tan (3 x) \sec^{2} (3 x) (\tan^{2} (3 x) + {\tan (3 x)}^{1 + 1})}{2}$

Step 4.26.3.4.4

Add $1$ and $1$ .

$\frac{\tan (3 x) \sec^{2} (3 x) (\tan^{2} (3 x) + \tan^{2} (3 x))}{2}$

Step 4.26.3.5

Add $\tan^{2} (3 x)$ and $\tan^{2} (3 x)$ .

$\frac{\tan (3 x) \sec^{2} (3 x) (2 \tan^{2} (3 x))}{2}$

Step 4.26.3.6

Rewrite using the commutative property of multiplication.

$\frac{2 \tan (3 x) \sec^{2} (3 x) \tan^{2} (3 x)}{2}$

Step 4.26.3.7

Multiply $\tan (3 x)$ by $\tan^{2} (3 x)$ by adding the exponents.

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Step 4.26.3.7.1

Move $\tan^{2} (3 x)$ .

$\frac{2 (\tan^{2} (3 x) \tan (3 x)) \sec^{2} (3 x)}{2}$

Step 4.26.3.7.2

Multiply $\tan^{2} (3 x)$ by $\tan (3 x)$ .

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Step 4.26.3.7.2.1

Raise $\tan (3 x)$ to the power of $1$ .

$\frac{2 (\tan^{2} (3 x) \tan^{1} (3 x)) \sec^{2} (3 x)}{2}$

Step 4.26.3.7.2.2

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

$\frac{2 {\tan (3 x)}^{2 + 1} \sec^{2} (3 x)}{2}$

Step 4.26.3.7.3

Add $2$ and $1$ .

$\frac{2 \tan^{3} (3 x) \sec^{2} (3 x)}{2}$

Step 4.26.4

Cancel the common factor of $2$ .

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Step 4.26.4.1

Cancel the common factor.

$\frac{2 \tan^{3} (3 x) \sec^{2} (3 x)}{2}$

Step 4.26.4.2

Divide $\tan^{3} (3 x) \sec^{2} (3 x)$ by $1$ .

$\tan^{3} (3 x) \sec^{2} (3 x)$

Step 5

Reform the equation by setting the left side equal to the right side.

$y' = \tan^{3} (3 x) \sec^{2} (3 x)$

Step 6

Replace $y'$ with $\frac{d y}{d x}$ .

$\frac{d y}{d x} = \tan^{3} (3 x) \sec^{2} (3 x)$