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 5, 6, and 7 - Page 959: 12


See below.

Work Step by Step

Using the given formula: $1+\cos 10x=1+2\cos^2 5x-1=2\cos^25x$ Hence we verified what we had to.
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