Answer
$sin~5θ-sin~3θ=2~cos~4θ~sin~θ$
Work Step by Step
$sin~5θ-sin~3θ=2~cos(\frac{5θ+3θ}{2})~sin(\frac{5θ-3θ}{2})=2~cos~4θ~sin~θ$
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: 53
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