Comment #1 on issue 2454 by [email protected]: Mul._eval_derivative should
use the quotient rule when possible
http://code.google.com/p/sympy/issues/detail?id=2454
Almost certainly the thing you want is fraction:
>>> from sympy import *
>>> var('x')
x
>>> eq=(x + 1)/(x - 2)
>>> fraction(eq)
(x + 1, x - 2)
>>> fraction(eq+3)
(3 + (x + 1)/(x - 2), 1)
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