The value of \( \int_{-\pi}^{\pi} \sin x f(\cos x) d x \) is (A) \( \pi \) (B) \( 2 \pi \) (C) \...

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The value of \( \int_{-\pi}^{\pi} \sin x f(\cos x) d x \) is
(A) \( \pi \)
(B) \( 2 \pi \)
(C) \( 2 f(1) \)
(D) none of these
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