Complete the identity.sin x (sin 3x + sin 5x) = ?

A.  cos x (cos 3x - cos 5x)
B.  cos x (cos 3x + cos 5x)
C. cos x (cos 3x - cos 5x)
D. cos x (cos 3x + cos 5x)


Answer: C

Mathematics

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A.
B.
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