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Complete the Identity sin⁡x(sin⁡2x+sin⁡4x)=\sin x ( \sin 2 x + \sin 4 x ) =

Question 94

Multiple Choice

Complete the identity.
- sin⁡x(sin⁡2x+sin⁡4x) =\sin x ( \sin 2 x + \sin 4 x ) = ?


A) cos⁡x(cos⁡2x−cos⁡4x) \cos x ( \cos 2 x - \cos 4 x )
B) cos⁡x(cos⁡2x+cos⁡4x) \cos x ( \cos 2 x + \cos 4 x )
C) 12cos⁡x(cos⁡2x−cos⁡4x) \frac { 1 } { 2 } \cos x ( \cos 2 x - \cos 4 x )
D) 12cos⁡x(cos⁡2x+cos⁡4x) \frac { 1 } { 2 } \cos x ( \cos 2 x + \cos 4 x )

Correct Answer:

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