#### Answer

$F$

#### Work Step by Step

$\cos 2\alpha =\cos ^{2}\alpha -\sin ^{2}\alpha \Rightarrow \cos 300=\cos ^{2}150-\sin ^{2}150\Rightarrow 25\rightarrow F$

Published by
Pearson

ISBN 10:
013421742X

ISBN 13:
978-0-13421-742-0

$F$

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