Trigonometry 7th Edition

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

Chapter 5 - Section 5.5 - Additional Identities - 5.5 Problem Set - Page 311: 22

Answer

$1 -2x^2$

Work Step by Step

$\theta = \sin^{-1} {x} $ $\sin{\theta} =x$ $\cos{2\theta} =1-2\sin^2 {\theta} = 1 -2x^2$
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