definite-integral

Question: $\int_{0}^{\pi }{\frac{dx}{1-2a\cos x+{{a}^{2}}}}\,$=



1) $\frac{\pi }{2(1-{{a}^{2}})}$
2) $\pi (1-{{a}^{2}})$
3) $\frac{\pi }{1-{{a}^{2}}}$
4) None of these
Solution: Explanation: No Explanation
Fundamental definite integration Definite integration by substitution

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