Precalculus Examples

$30 °$

Step 1

The exact value of $\cos (30 °)$ is $\frac{\sqrt{3}}{2}$ .

$\frac{\sqrt{3}}{2}$

Step 2

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

$\frac{1}{2}$

Step 3

Set up the coordinates $(\cos (θ), \sin (θ))$ .

$(\frac{\sqrt{3}}{2}, \frac{1}{2})$