Precalculus (10th Edition)

Published by Pearson
ISBN 10: 0-32197-907-9
ISBN 13: 978-0-32197-907-0

Chapter 7 - Analytic Trigonometry - Chapter Review - Review Exercises - Page 507: 87

Answer

$cos(2\theta)=2cos^2(\theta)-1$

Work Step by Step

Use the formula $cos(2\theta)=2cos^2(\theta)-1$
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