Trigonometry Examples

$\sin (- 210)$

Step 1

Apply the reference angle by finding the angle with equivalent trig values in the first quadrant.

$\sin (30)$

Step 2

The exact value of $\sin (30)$ is $\frac{1}{2}$ .

$\frac{1}{2}$

Step 3

The result can be shown in multiple forms.

Exact Form:

$\frac{1}{2}$

Decimal Form:

$0.5$