Trigonometry Examples

$\tan (90)$

Step 1

Rewrite $\tan (90)$ in terms of sines and cosines.

$\frac{\sin (90)}{\cos (90)}$

Step 2

The exact value of $\cos (90)$ is $0$ .

$\frac{\sin (90)}{0}$

Step 3

The expression contains a division by $0$ . The expression is undefined.

Undefined