Precalculus (6th Edition)

Published by Pearson
ISBN 10: 013421742X
ISBN 13: 978-0-13421-742-0

Chapter 7 - Trigonometric Identities and Equations - Chapter 7 Test Prep - Review Exercises - Page 736: 22



Work Step by Step

$\cos \alpha =\sqrt {\dfrac {1+\cos 2\alpha }{2}}\Rightarrow \cos 75=\sqrt {\dfrac {1+\cos 150}{2}}\Rightarrow 22\rightarrow C$
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