Trigonometry Examples

$\sec (- 630)$

Step 1

Rewrite $\sec (- 630)$ in terms of sines and cosines.

$\frac{1}{\cos (- 630)}$

Step 2

Add full rotations of $360$ ° until the angle is between $0$ ° and $360$ °.

$\frac{1}{\cos (90)}$

Step 3

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

$\frac{1}{0}$

Step 4

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

Undefined