$$\int\limits_0^{2\pi} \int\limits_0^{2\pi} {\min \{ x-y, 2\pi- (x-y) \} e^{a\cos(x)} e^{a\cos(y)}} dx dy, \qquad a\in\mathbb R. $$$$\int\limits_0^{2\pi} \int\limits_0^{2\pi} \min \{ x-y, 2\pi- (x-y) \} e^{a\cos(x)} e^{a\cos(y)} \, dx \, dy, \qquad a\in\mathbb R. $$ I tried to find the value of the integral following the method proposed in this example: however I didn't succeed so I posted the question here looking forward to your experience.
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Daniele Tampieri
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