Question
Evaluate the integral$\int_0^{2 \pi} \frac{\mathrm{~d} \phi}{\left[1+k^2-2 k \cos \left(\phi-\phi_0\right)\right]^2\left[1+k_1^2-2 k_1 \cos (\phi-\psi)\right]}$, for $k<1$ and $k_1<1$.
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