For this function : Exp[-Cos[x]]*Cos[x/3]], integrated from 0 to 3*Pi. The numerical result suggests that this integral may gives 0. However, I couldn't find a way to analytically show it's 0. Could anyone tell me how to prove this ?(adsbygoogle = window.adsbygoogle || []).push({});

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# How to prove this integral is 0 ?

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