\int_{0}^\pi e^{cos^2x} cos^3[(2n+1)x]

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# Doubt from integration

I have to ask two things, first, is the square bracket, the greatest integer function?? Please specify the case always in the questions. And second, if its not GIF, is the answer 0??

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**Tushar_2019**#8

On what basis u have put x= \pi - x (since then dx will be 0). Could u please explain this in more detail @Samrat_2020