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: 84

Answer

The given equation is an identity. Refer to the graph below.
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Work Step by Step

Use a graphing utility to graph $y=\cos{(2x)}$ and $y=\cos^2{x}-\sin^2{x}$. Refer to the graph above. Since the graphs are exactly the same, then the given equation is an identity.
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