The value of the integral \( \int_{0}^{\pi} \frac{1}{a^{2}-2 a \cos x+1} d x(a1) \), is (A) \( \...
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0The value of the integral \( \int_{0}^{\pi} \frac{1}{a^{2}-2 a \cos x+1} d x(a1) \), is
(A) \( \frac{\pi}{1-a^{2}} \)
(B) \( \frac{\pi}{a^{2}-1} \)
(C) \( \frac{2 \pi}{a^{2}-1} \)
(D) \( \frac{2 \pi}{1-a^{2}} \)
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