Updates:
        Status: Valid
        Cc: [email protected]

Comment #1 on issue 3220 by [email protected]: Integrating Borwein integrals hangs
http://code.google.com/p/sympy/issues/detail?id=3220

That's because the Meijer G algorithm can't do the third one, so it passes it off to heurisch, which just takes forever. If you are computing the definite integral of a function that you are pretty sure doesn't have an elementary anti-derivative, you can skip trying heurisch by passing meijerg=True to integrate().

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