Algebra and Trigonometry 10th Edition

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: 55

Answer

$cos~6x+cos~2x=2~cos~4x~cos~2x$

Work Step by Step

$cos~6x+cos~2x=2~cos(\frac{6x+2x}{2})~cos(\frac{6x-2x}{2})=2~cos~4x~cos~2x$
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