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 - 14.3 Verify Trigonometric Identities - 14.3 Exercises - Skill Practice - Page 928: 13



Work Step by Step

Using the given identities: $\cos\theta(1+\tan^2\theta)=\cos\theta\sec^2\theta=\cos\theta\frac{1}{\cos^2\theta}=\frac{1}{\cos\theta}=\sec\theta$
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