Trigonometry Examples

$\sec (90)$

Step 1

To convert degrees to radians, multiply by $\frac{π}{180 °}$ , since a full circle is $360 °$ or $2 π$ radians.

Step 2

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

$\frac{1}{\cos (90)} \cdot \frac{π}{180}$ radians

Step 3

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

$\frac{1}{0} \cdot \frac{π}{180}$ radians

Step 4

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

Undefined