Asked by Chris Math Hw Help

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
Answered by Steve
Looks like D to me.

sin u + sin v = 2 sin(½(u+v)) cos(½(u−v))
There are no AI answers yet. The ability to request AI answers is coming soon!