Trigonometry 7th Edition

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

Chapter 6 - Section 6.2 - More on Trigonometric Equations - 6.2 Problem Set - Page 333: 47



Work Step by Step

$cos(\frac{\theta}{2})-cos(\theta)=0$ The solution is :$\;\;\;\;\;\theta=120^o\;\;\;\;\;\;\;\;or\;\;\;\;\;\;\;\;\theta=180^o$ The expression of all solutions is: $\theta=120^o+360k\;\;\;\;\;\;\;\;\;\;\;\;\;or\;\;\;\;\;\;\;\;\theta=180^o+360k\;\;\;\;\;\;\;\;\;\;\;\;\;\;\;\;\;\;\;\;\;\;\;where \;\;\;\;\;\;\;\;\;\;k=\{0,1,2,3,......\}$ $\theta=120^o+360k\;\;\;\;\;\;\;\;\;\;\;\;\;,\;\;\;\;\;\;\;\;\theta=180^o+360k$
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