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does anyone knows the standard answer for

integral of cos(2deta)cos(ndeta) from 0 to 180 degress?

for instance for integral of sin(ndeta)sin(deta) 0 to 180 degress, when n=1, it is 90 degress and when n not equals 1, it is 0...

thanks

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# Standard answer for integral of cos(2deta)cos(ndeta)

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