I accept any suggestion in how to work out the integral below. It is a simplification of an integral over all k space. It had 16 terms and I am down to this 4. The idea is to integrate it from 0 to pi in respect of x, and y.(adsbygoogle = window.adsbygoogle || []).push({});

int{int{(-1-4 cos(x)^2*cos(y)^2+4cos(y)^2+cos(x)^2) / (1+4cos(y)^2+4cos(y)cos(x)dx}dy}

both with limits from 0 to pi.

Examples are:

int{int{sin(x)^2*cos(y)^2 dx}dy} = 1/4 pi.

I tried maple and matematica but didn't work. I strongly believe it is suppose to come out as a nice round integer number.

tks...

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# Help with integral

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