Comment #19 on issue 1598 by smichr: New polynomials manipulation module
http://code.google.com/p/sympy/issues/detail?id=1598
Was I right in deleting trim and cancel from simplify, Matteusz?
Also, factor still should be doing something different. It's failing to
factor this
function:
>>> from sympy import *
>>> var('a x')
(a, x)
>>> f21 = (1 - x)**2*(4 + x)/((2 + x)*(a + x))
>>> f=diff(f21,x,3)
>>> type(factor(f))
<class 'sympy.core.add.Add'> <=== we should have gotten a Mul
>>> n,d=f.as_numer_denom()
>>> type(factor(n))
<class 'sympy.core.mul.Mul'> <=== it *is* factorable
>>> factor(f)==f.expand()
True <=== but factor(f) is not factoring it
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