Precalculus (6th Edition)

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

Chapter 7 - Trigonometric Identities and Equations - 7.1 Fundamental Identities - 7.1 Exercises - Page 657: 3

Answer

$\Rightarrow 3\rightarrow E$

Work Step by Step

$\cos \left( -x\right) =\cos x$ (Because cosine is even function) $\Rightarrow 3\rightarrow E$
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