Hi, I wonder if there is an easy way to multiply the numerator and
denominator of a rational expression by the same factor. I'd like to do
this to group terms so that I can make a substitution.
I tried making a function to do this:
def tb(exp,factor):
if exp.func==Mul and exp.args[-1].func==Pow \
and exp.args[-1].args[-1]==-1:
e=exp*factor
denom=e.args[-1].args[0] * factor
e.args[-1].args[0] = denom
return e
Unfortunately it doesn't work because of immutable tuples.
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