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 - Guided Practice for Examples 1, 2, and 3 - Page 956: 6



Work Step by Step

Using the given formula and the known values: $\frac{\cos(2\theta)}{\sin\theta+\cos\theta}=\frac{\cos^2\theta-\sin^2\theta}{\sin\theta+\cos\theta}=\frac{(\sin\theta+\cos\theta)(\cos\theta-\sin\theta)}{\sin\theta+\cos\theta}=\cos\theta-\sin\theta$
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