Answer
$F$
Work Step by Step
$\cos 2\alpha =\cos ^{2}\alpha -\sin ^{2}\alpha \Rightarrow \cos 300=\cos ^{2}150-\sin ^{2}150\Rightarrow 25\rightarrow F$
Precalculus (6th Edition)
by Lial, Margaret L.; Hornsby, John; Schneider, David I.; Daniels, Callie
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: 25
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