Precalculus Examples

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

Step 1

Start on the left side.

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

Step 2

Convert to sines and cosines.

Tap for more steps...

Step 2.1

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

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

Step 2.2

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

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

Step 3

Simplify.

Tap for more steps...

Step 3.1

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

Tap for more steps...

Step 3.1.1

Cancel the common factor.

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

Step 3.1.2

Rewrite the expression.

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

Step 3.2

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

Tap for more steps...

Step 3.2.1

Cancel the common factor.

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

Step 3.2.2

Rewrite the expression.

$1$

Step 4

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

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