\(\sin^4 4x = \dotso\)
(A) \(\dfrac 18 + \dfrac 18 \cos 2x + \dfrac 18 \cos 4x \)
(B) \(\dfrac 18 - \dfrac 18 \cos 2x + \dfrac 18 \cos 4x \)
(C) \(\dfrac 38 - \dfrac 18 \cos 2x + \dfrac 18 \cos 4x \)
(D) \(\dfrac 38 - \dfrac 12 \cos 2x + \dfrac 18 \cos 4x \)
(E) \(\dfrac 38 - \dfrac 12 \cos 2x + \dfrac 14 \cos 4x \)
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