Trigonometry Examples

$45 °$

Step 1

The exact value of $\cos (45 °)$ is $\frac{\sqrt{2}}{2}$ .

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

Step 2

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

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