Answer
-$\frac{1}{2}$
Work Step by Step
(-$\frac{1}{2}$ , $\frac{\sqrt 3}{2}$)
cos$\frac{2\pi}{3}$ corresponds to x value.
So cos$\frac{2\pi}{3}$ = -$\frac{1}{2}$.
Precalculus (6th Edition) Blitzer
by Blitzer, Robert F.
Published by
Pearson
ISBN 10:
0-13446-914-3
ISBN 13:
978-0-13446-914-0
Chapter 4 - Section 4.2 - Trigonometric Functions: The Unit Circle - Exercise Set - Page 547: 8
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