The period of the function \( f(x)=\sin ^{4} 3 x+\cos ^{4} 3 x \) (A) \( \pi / 2 \) (B) \( \pi /...

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The period of the function \( f(x)=\sin ^{4} 3 x+\cos ^{4} 3 x \)
(A) \( \pi / 2 \)
(B) \( \pi / 3 \)
(C) \( \pi / 6 \)
(D) none of these
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