Trigonometry 7th Edition

Published by Cengage Learning
ISBN 10: 1111826854
ISBN 13: 978-1-11182-685-7

Chapter 6 - Section 6.3 - Trigonometric Equations Involving Multiple Angles - 6.3 Problem Set - Page 340: 20



Work Step by Step

$cos(3\theta)=-1$ $3\theta=cos^{-1}(-1)$ The period of the cosine function is $360^o$ $3\theta=180^o+360^ok\;\;\;\;\;\;\;\;\;\;\;\;\;\; $ $\theta=60^o+120^ok\;\;\;\;\;\;\;\;\;\;\;\;\;\; $ $\theta=\{60^o+120^ok\;\;\},\;\;\;\;\;\;\;\;\;\;when \;\;\;K=\{0,1,2,3\}$
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