# Chapter 4 - Section 4.2 - Trigonometric Functions: The Unit Circle - Exercise Set - Page 548: 71

$-2a$

#### Work Step by Step

RECALL: (1) $\sin{(-t)} = -\sin{t}$ (2) $\cos{(-t)} = \cos{t}$ (3) $\tan{(-t)} = -\tan{t}$ Use the given and rule (1) above to obtain: $=-\sin{t} -\sin{t} \\=-a - a \\=-2a$

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