Answer
$y=\cos 4x$
Work Step by Step
Using the identity $\cos(-x)=\cos x$,
We have $y=\cos(-4x)=\cos 4x$
Trigonometry (11th Edition) Clone
by Lial, Margaret L.; Hornsby, John; Schneider, David I.; Daniels, Callie
Published by
Pearson
ISBN 10:
978-0-13-421743-7
ISBN 13:
978-0-13421-743-7
Chapter 5 - Trigonometric Identities - Section 5.1 Fundamental Identities - 5.1 Exercises - Page 202: 87
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