Precalculus (6th Edition)

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: 70

Answer

$s=\dfrac{2\pi}{3}$

Work Step by Step

Use the inverse cosine function of a calculator in radian mode to obtain: $s=\cos^{-1}{(-\frac{1}{2})} = \frac{2\pi}{3}$
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