# Chapter 4 - Section 4.2 - Trigonometric Functions: The Unit Circle - Exercise Set - Page 548: 21

a.)$\frac{1}{2}$ b.)-$\frac{1}{2}$

#### Work Step by Step

a.)sin$\frac{5\pi}{6}$ corresponds to y value. sin$\frac{5\pi}{6}$ = $\frac{1}{2}$ b.)Sine is an odd function, so sin(-t) = -sin t. sin-$\frac{5\pi}{6}$ = - sin$\frac{5\pi}{6}$ = -$\frac{1}{2}$

After you claim an answer you’ll have 24 hours to send in a draft. An editor will review the submission and either publish your submission or provide feedback.