\( \int_{0}^{\pi} \frac{1}{1+3^{\cos x}} d x \) is equal to (A) \( \pi \) (B) \( \pi / 2 \) (C) ...

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\( \int_{0}^{\pi} \frac{1}{1+3^{\cos x}} d x \) is equal to
(A) \( \pi \)
(B) \( \pi / 2 \)
(C) none of these
(D) undefined
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