Let \( f(x)=\cos 10 x+\cos 8 x+3 \cos 4 x+3 \cos 2 x \) and \( g(x)...

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Let \( f(x)=\cos 10 x+\cos 8 x+3 \cos 4 x+3 \cos 2 x \) and \( g(x)=8 \cos x \cdot \cos ^{3} 3 x \), then for all \( x \) we have
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(a) \( f(x)=g(x) \)
(b) \( 2 f(x)=3 g(x) \)
(c) \( f(x)=2 g(x) \)
(d) \( 2 f(x)=g(x) \)
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