Comment #3 on issue 2672 by [email protected]: UnificationFailed with
integrate(-diff(y/(x**2 + y**2), y), x)
http://code.google.com/p/sympy/issues/detail?id=2672
Something changed in the mean time, I now get this:
In [1]: x, y = symbols('x y', real=True)
In [2]: integrate(-diff(y/(x**2 + y**2), y), x)
Out[2]:
2
2⋅x⋅y
──────────────
2 2 4
2⋅x ⋅y + 2⋅y
So it doesn't crash, but it misses a simplification call in the end. I'm
not really familiar with the code, just commenting because of the Python 3
tag. :)
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