Answer
$s=\dfrac{2\pi}{3}$
Work Step by Step
Use the inverse cosine function of a calculator in radian mode to obtain:
$s=\cos^{-1}{(-\frac{1}{2})} = \frac{2\pi}{3}$
Precalculus (6th Edition)
by Lial, Margaret L.; Hornsby, John; Schneider, David I.; Daniels, Callie
Published by
Pearson
ISBN 10:
013421742X
ISBN 13:
978-0-13421-742-0
Chapter 6 - The Circular Functions and Their Graphs - 6.2 The Unit Circle and Circular Functions - 6.2 Exercises - Page 589: 70
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