Trigonometry (11th Edition) Clone

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: 88

Answer

$\cos(-4x)$ and $-\cos(4x)$ are negatives of each other.

Work Step by Step

The answer to Exercise 87 is $y=-\cos(4x)$. This means that there is a negative relationship between this answer and $y=\cos(4x)$, making $\cos(-4x)=-\cos(4x)$ an even-odd identity.
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