QuestionQuestion 1 (2 points) Use the Unit Circle to match the following cosine functions to their exact value.
1. 1
2. $-\frac{\sqrt{2}}{2}$ $\cos \left(90^{\circ}\right)$ $\cos \left(300^{\circ}\right)$ $\cos \left(390^{\circ}\right)$ $\cos \left(-120^{\circ}\right)$ $\cos \left(150^{\circ}\right)$
3. $\frac{\sqrt{2}}{2}$
4. -1
5. $\frac{1}{2}$
6. $-\frac{\sqrt{3}}{2}$
7. $\frac{\sqrt{3}}{2}$
8. 0
9. $-\frac{1}{2}$

Studdy Solution
Provide the exact values for each cosine function:
1. $\cos(90^\circ) = 0$
2. $\cos(300^\circ) = \frac{1}{2}$
3. $\cos(390^\circ) = \frac{\sqrt{3}}{2}$
4. $\cos(-120^\circ) = -\frac{1}{2}$
5. $\cos(150^\circ) = -\frac{\sqrt{3}}{2}$
The cosine values matched to their respective angles are:
1. $\cos(90^\circ) = 0$
2. $\cos(300^\circ) = \frac{1}{2}$
3. $\cos(390^\circ) = \frac{\sqrt{3}}{2}$
4. $\cos(-120^\circ) = -\frac{1}{2}$
5. $\cos(150^\circ) = -\frac{\sqrt{3}}{2}$