Calculus Examples

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

Step 1

Separate fractions.

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

Step 2

Convert from $\frac{\sin (x)}{\cos (x)}$ to $\tan (x)$ .

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

Step 3

Convert from $\frac{\sin (y)}{\cos (y)}$ to $\tan (y)$ .

$\tan (y) \tan (x)$