$${\it ?}= \int_{0}^{\pi}\ln\left ( \alpha^{2}- 2\alpha\cos x+ 1 \right ){\rm d}x\quad{\rm for}\,x> 1$$
8/9/2019 hard Feynman trick on StackMath
$${\it ?}= \int_{0}^{\pi}\ln\left ( \alpha^{2}- 2\alpha\cos x+ 1 \right ){\rm d}x\quad{\rm for}\,x> 1$$
8/9/2019 hard Feynman trick on StackMath
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