Posted by **Chris** on Thursday, April 18, 2013 at 11:42am.

Which expression is equivalent to sin(3x) + sin x?

A.

2cos(2x)sin x

B.

2sin(2x)sin x

C.

-2sin(2x)cos x

D.

2sin(2x)cos x

E.

-2cos(2x)sin x

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