Answer
cos(2u) = $cos^{2}u - sin^{2}u = 2cos^{2}u - 1 = 1- 2sin^{2}u$
Work Step by Step
cos(2u) = $cos^{2}u - sin^{2}u = 2cos^{2}u - 1 = 1- 2sin^{2}u$
From the Double-Angle Formula
Algebra and Trigonometry 10th Edition
by Larson, Ron
Published by
Cengage Learning
ISBN 10:
9781337271172
ISBN 13:
978-1-33727-117-2
Chapter 7 - 7.5 - Multiple-Angle and Product-to-Sum Formulas - 7.5 Exercises - Page 548: 2
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