Precalculus Examples

$\sec (- 270)$

Step 1

Rewrite $\sec (- 270)$ in terms of sines and cosines.

$\frac{1}{\cos (- 270)}$

Step 2

Evaluate $\cos (- 270)$ .

$\frac{1}{0}$

Step 3

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

Undefined