Answer
$sin~3x-sin~x=2~cos~2x~sin~x$
Work Step by Step
$sin~3x-sin~x=2~cos(\frac{3x+x}{2})~sin(\frac{3x-x}{2})=2~cos~2x~sin~x$
Algebra and Trigonometry 10th Edition
by Larson, Ron
Published by
Cengage Learning
ISBN 10:
9781337271172
ISBN 13:
978-1-33727-117-2
Chapter 7 - Review Exercises - Page 553: 78
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