Comment #5 on issue 1428 by xoed...@gmail.com: wrong result for integral of sin(k*x)*sin(m*x) over [0,pi]
http://code.google.com/p/sympy/issues/detail?id=1428
Such a requirement (m and k being integers) is pretty standard when doing Fourier decomposition. The integral in question (or a form similar to it, perhaps with different limits) is often used to ensure that the functions A*sin(m*x) are ortho-normal to each other.
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