Precalculus Examples

$\csc (210)$

Step 1

Apply the reference angle by finding the angle with equivalent trig values in the first quadrant. Make the expression negative because cosecant is negative in the third quadrant.

$- \csc (30)$

Step 2

The exact value of $\csc (30)$ is $2$ .

$- 1 \cdot 2$

Step 3

Multiply $- 1$ by $2$ .

$- 2$