Algebra 2 (1st Edition)

Published by McDougal Littell
ISBN 10: 0618595414
ISBN 13: 978-0-61859-541-9

Chapter 14 Trigonometric Graphs, Identities, and Equations - 14.7 Apply Double-Angle and Half-Angle Formulas - 14.7 Exercises - Skill Practice - Page 960: 21



Work Step by Step

Use the Identity $\cos 2 \theta =1-2 \sin^2 \theta$ Thus, we have $\dfrac{ \cos 2 \theta}{1- 2\sin^2 \theta}=\dfrac{\cos 2 \theta}{\cos 2 \theta}=1$
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