Precalculus Examples

$\sin (x) \cdot \sec (x) = \tan (x)$

Step 1

Simplify the left side.

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Step 1.1

Simplify $\sin (x) \cdot \sec (x)$ .

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Step 1.1.1

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

$\sin (x) \cdot \frac{1}{\cos (x)} = \tan (x)$

Step 1.1.2

Combine $\sin (x)$ and $\frac{1}{\cos (x)}$ .

$\frac{\sin (x)}{\cos (x)} = \tan (x)$

Step 2

Simplify the right side.

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Step 2.1

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

$\frac{\sin (x)}{\cos (x)} = \frac{\sin (x)}{\cos (x)}$

Step 3

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

$\cos (x) \frac{\sin (x)}{\cos (x)} = \cos (x) \frac{\sin (x)}{\cos (x)}$

Step 4

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

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Step 4.1

Cancel the common factor.

$\cos (x) \frac{\sin (x)}{\cos (x)} = \cos (x) \frac{\sin (x)}{\cos (x)}$

Step 4.2

Rewrite the expression.

$\sin (x) = \cos (x) \frac{\sin (x)}{\cos (x)}$

Step 5

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

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Step 5.1

Cancel the common factor.

$\sin (x) = \cos (x) \frac{\sin (x)}{\cos (x)}$

Step 5.2

Rewrite the expression.

$\sin (x) = \sin (x)$

Step 6

For the two functions to be equal, the arguments of each must be equal.

$x = x$

Step 7

Move all terms containing $x$ to the left side of the equation.

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Step 7.1

Subtract $x$ from both sides of the equation.

$x - x = 0$

Step 7.2

Subtract $x$ from $x$ .

$0 = 0$

Step 8

Since $0 = 0$ , the equation will always be true for any value of $x$ .

All real numbers

Step 9

The result can be shown in multiple forms.

All real numbers

Interval Notation:

$(- \infty, \infty)$