Trigonometry Examples

$\sec (90 °)$

Step 1

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

$\frac{1}{\cos (90 °)}$

Step 2

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

$\frac{1}{0}$

Step 3

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

Undefined