## Practice 2: Exact values with a ref angle

Determine the exact value of $\tan 120^\circ$ . (Decimal approximations will **NOT** be accepted.)

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$120^\circ$ is in Quadrant II. <br/>
- $\tan(120^\circ) < 0$ <br/>
- $ref(120^\circ)=180^\circ-120^\circ= 60^\circ$
$$\tan 120^\circ=-\tan(60^\circ)=-\sqrt{3}$$

![](lib/pic/p2.svg)
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