Updates:
Status: NeedsDecision
Labels: -NeedsBetterPatch -smichr
Comment #4 on issue 2820 by [email protected]: expand() doesn't work in the
denominator
http://code.google.com/p/sympy/issues/detail?id=2820
From pull request 700 Aaron says:
This is a nice solution for issue 849, but I'm not sure if it is the best
solution
for issue 2820. In general, would want something like `expand((a +
b)/(x*(1 + y)))`
to return `a/(x + y*x) + b/(x + y*x)`. In other words, the problem with
that issue
is that expand() is not recursing inside of negative powers for some
reason, even
with deep=True.
sympy doesn't like this type of automatic expansion of the denominator, e.g.
simplify(ratint(a/(b*c*x**2 + a**2 + b*a), x))
gives
>>> print text(eq2)
sqrt(-a/(b*c*(a + b)))*(-log(-a*sqrt(-a/(b*c*(a + b))) -
b*sqrt(-a/(b*c*(a + b))) + x) + log(a*sqrt(-a/(b*c*(a + b)))
+ b*sqrt(-a/(b*c*(a + b))) + x))/2
rather than
>>> print text(eq)
sqrt(a)*atan(sqrt(b)*sqrt(c)*x/(sqrt(a)*sqrt(a +
b)))/(sqrt(b)*sqrt(c)*sqrt(a + b))
so it's perhaps better to leave this in the hands of the user through the
numer_expand, denom_expand and fraction_expand functionality.
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