Answer
$y=2-2cos(x)$
Work Step by Step
$y=4sin^2(\frac{x}{2})$
Remember$\;\;\;\;\;sin(\frac{x}{2})=\pm \sqrt{\frac{1-cos(x)}{2}}$
$y=4(\pm \sqrt{\frac{1-cos(x)}{2}})^2$
$y=4 .\frac{1-cos(x)}{2}$
$y=2(1-cos(x))=2-2cos(x)$
$y=2-2cos(x)$
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: 67
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