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: 68

Answer

$y=3+3cos(x)$

Work Step by Step

$y=6cos^2(\frac{x}{2})$ Remember$\;\;\;\;\;cos(\frac{x}{2})=\pm \sqrt{\frac{1+cos(x)}{2}}$ $y=6(\pm \sqrt{\frac{1+cos(x)}{2}})^2$ $y=6 .\frac{1+cos(x)}{2}$ $y=3(1+cos(x))=3+3cos(x)$ $y=3+3cos(x)$
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