Complete the identity.
-$\sin x ( \sin 2 x + \sin 4 x ) =$ ?
A) $\cos x ( \cos 2 x - \cos 4 x )$
B) $\cos x ( \cos 2 x + \cos 4 x )$
C) $\frac { 1 } { 2 } \cos x ( \cos 2 x - \cos 4 x )$
D) $\frac { 1 } { 2 } \cos x ( \cos 2 x + \cos 4 x )$

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The Answer of Complete the identity.
-$\sin x ( \sin 2 x + \sin 4 x ) =$ ?
A) $\cos x ( \cos 2 x - \cos 4 x )$
B) $\cos x ( \cos 2 x + \cos 4 x )$
C) $\frac { 1 } { 2 } \cos x ( \cos 2 x - \cos 4 x )$
D) $\frac { 1 } { 2 } \cos x ( \cos 2 x + \cos 4 x )$

Complete the Identity sin⁡x(sin⁡2x+sin⁡4x)=\sin x ( \sin 2 x + \sin 4 x ) =sinx(sin2x+sin4x)=

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