### Evaluating Trigonometric Functions In Exerrises $… 03:13 University of Southern California Problem 22 Evaluating Trigonometric Functions In Exerrises$21-24\$ , evaluate the sine, cosine, and tangent of each angle. Do not use a calculator.
$$\begin{array}{lll}{(a)-30^{\circ}} & {\text { (b) } 150^{\circ}} & {\text { (c) }-\frac{\pi}{6}} & {\text { (d) } \frac{\pi}{2}}\end{array}$$

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