# Chapter 4 - Section 4.2 - Trigonometric Functions: The Unit Circle - Exercise Set - Page 548: 41

-$\frac{\sqrt 2}{2}$

#### Work Step by Step

sin(-t) = -sint -sin($\frac{\pi}{4}$ + 2$\pi$) = -sin$\frac{\pi}{4}$ -sin$\frac{\pi}{4}$ = -$\frac{\sqrt 2}{2}$

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