Comment #5 on issue 588 by asmeurer: simplify should be better at detecting
repeated factors
http://code.google.com/p/sympy/issues/detail?id=588
This is fixed in the new polys, but it needs to be tested:
In [1]: e = integrate(x**2 * exp(x) * cos(x), x)
In [2]: e
Out[2]:
x 2 x x 2 x
ℯ ⋅sin(x) x ⋅ℯ ⋅sin(x) x cos(x)⋅ℯ x ⋅cos(x)⋅ℯ
───────── + ──────────── - x⋅ℯ ⋅sin(x) - ───────── + ────────────
2 2 2 2
In [3]: factor(e)
Out[3]:
x
-(1 - x)⋅(-sin(x) + x⋅cos(x) + x⋅sin(x) + cos(x))⋅ℯ
────────────────────────────────────────────────────
2
I actually don't see any tests for factoring advanced expressions like this.
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