Answer
$sin~x~cos~2x+cos~x~sin~2x=sin~3x$
Work Step by Step
$sin(u+v)=sin~u~cos~v+cos~u~sin~v$
$sin~x~cos~2x+cos~x~sin~2x=sin(x+2x)=sin~3x$
Algebra and Trigonometry 10th Edition
by Larson, Ron
Published by
Cengage Learning
ISBN 10:
9781337271172
ISBN 13:
978-1-33727-117-2
Chapter 7 - 7.4 - Sum and Difference Formulas - 7.4 Exercises - Page 538: 34
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