Which expression does (sin x)(cos 2x) + (cos x)(sin 2x) simplify to?  cos 3x  −sin x  sin 3x  cos(−3x)

Algebra & Trigonometry with Analytic Geometry
13th Edition
ISBN:9781133382119
Author:Swokowski
Publisher:Swokowski
Chapter7: Analytic Trigonometry
Section: Chapter Questions
Problem 18T
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Which expression does (sin x)(cos 2x) + (cos x)(sin 2x) simplify to?

 cos 3x 

−sin x 

sin 3x 

cos(−3x)

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