समाकल \( \int_{0}^{1} \frac{1}{x^{2}+2 x \cos \alpha+1} d x \) का मान है- (A) \( \sin \alpha \) ...
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समाकल \( \int_{0}^{1} \frac{1}{x^{2}+2 x \cos \alpha+1} d x \) का मान है-
(A) \( \sin \alpha \)
(B) \( 2 \alpha \sin \alpha \)
(C) \( \alpha \sin \alpha \)
(D) \( \frac{\alpha}{2} \sin \alpha \)
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