\[\int_{0}^{\pi }{\frac{dx}{1-2a\cos x+{{a}^{2}}}}\,\]= [CEE 1993]

\[\frac{\pi }{2(1-{{a}^{2}})}\]

\[\int_{0}^{\pi }{\frac{dx}{1-2a\cos x+{{a}^{2}}}}\,\]= �

1.	\[\int_{0}^{\pi }{\frac{dx}{1-2a\cos x+{{a}^{2}}}}\,\]= [CEE 1993]
A.	\[\frac{\pi }{2(1-{{a}^{2}})}\]
B.	\[\pi (1-{{a}^{2}})\]
C.	\[\frac{\pi }{1-{{a}^{2}}}\]
D.	None of these
Answer» D. None of these

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\[\int_{0}^{\pi }{\frac{dx}{1-2a\cos x+{{a}^{2}}}}\,\]= [CEE 1993]

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