Precalculus Examples

$\csc (x) \cdot \cos (x) \cdot \tan (x) = 1$

Step 1

Start on the left side.

$\csc (x) \cdot \cos (x) \cdot \tan (x)$

Step 2

Convert to sines and cosines.

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Step 2.1

Apply the reciprocal identity to $\csc (x)$ .

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

Step 2.2

Write $\tan (x)$ in sines and cosines using the quotient identity.

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

Step 3

Simplify.

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Step 3.1

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

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Step 3.1.1

Factor $\cos (x)$ out of $\frac{1}{\sin (x)} \cdot \cos (x)$ .

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

Step 3.1.2

Cancel the common factor.

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

Step 3.1.3

Rewrite the expression.

$\frac{1}{\sin (x)} \cdot \sin (x)$

Step 3.2

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

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

Step 3.3

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

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Step 3.3.1

Cancel the common factor.

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

Step 3.3.2

Rewrite the expression.

$1$

Step 4

Because the two sides have been shown to be equivalent, the equation is an identity.

$\csc (x) \cdot \cos (x) \cdot \tan (x) = 1$ is an identity