\( \int_{0}^{\pi} x f(\sin x) d x=\ldots \) (A) \( 0 \) (B) \( \frac{\pi}{2} \int_{0}^{\pi} f(\s...
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0\( \int_{0}^{\pi} x f(\sin x) d x=\ldots \)
(A) \( 0 \)
(B) \( \frac{\pi}{2} \int_{0}^{\pi} f(\sin x) d x \)
(C) \( 2 \pi \int_{0}^{\pi} f(\sin x) d x \)
(D) \( \int_{0}^{\pi} f(-\sin x) d x \)
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