Trigonometry Examples

$9 \tan (- x) \cos (x)$

Step 1

Since $\tan (- x)$ is an odd function, rewrite $\tan (- x)$ as $- \tan (x)$ .

$9 (- \tan (x)) \cos (x)$

Step 2

Rewrite in terms of sines and cosines, then cancel the common factors.

Tap for more steps...

Step 2.1

Move parentheses.

$9 (- \tan (x) \cos (x))$

Step 2.2

Add parentheses.

$9 (- (\tan (x) \cos (x)))$

Step 2.3

Rewrite $9 (- \tan (x)) \cos (x)$ in terms of sines and cosines.

$9 (- (\frac{\sin (x)}{\cos (x)} \cos (x)))$

Step 2.4

Cancel the common factors.

$9 (- \sin (x))$

Step 3

Multiply $- 1$ by $9$ .

$- 9 \sin (x)$