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1-158.

Visualize the angle on the unit circle. What side ratio correspond with that angle? What quadrant is it in? (This will determine whether your answer will be positive or negative.)

$\frac{1}{2}$

See hint in part (a).

$\text{Recall that tan}(a)=\frac{\text{sin}(a)}{\text{cos}(a)}$

$\text{Recall that sec}(a)=\frac{1}{\text{cos}(a)}$