Answer
$y=3+3cos(x)$
Work Step by Step
$y=6cos^2(\frac{x}{2})$
Remember$\;\;\;\;\;cos(\frac{x}{2})=\pm \sqrt{\frac{1+cos(x)}{2}}$
$y=6(\pm \sqrt{\frac{1+cos(x)}{2}})^2$
$y=6 .\frac{1+cos(x)}{2}$
$y=3(1+cos(x))=3+3cos(x)$
$y=3+3cos(x)$
Trigonometry 7th Edition
by McKeague, Charles P.; Turner, Mark D.
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
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