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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

1 answer

well, you have the formula

sin(u)+sin(v) = 2 sin (u+v)/2 cos (u-v)/2

So plug in u=3x and v=x
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