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