Comment #4 on issue 1792 by [email protected]: SymPy does not integrate a real power of sine/cosine
http://code.google.com/p/sympy/issues/detail?id=1792
This seems unlikely to me. As far as I can tell, cos(x)^r is not a meijer g-function unless r is a positive integer.
The way to do this integral is to substitute u=cos(x). The resulting integral can be done by meijerint_indefinite. I have no idea how to do this systematically.
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