Comment #5 on issue 1568 by smichr: factoring is working too hard
http://code.google.com/p/sympy/issues/detail?id=1568
Also, perhaps factor should do deep factoring first to obtain a better
factorization.
Consider:
df=-(1 - x)**2*(4 + x)/((2 + x)*(a + x)**2) - (1 - x)**2*(4 + x)/((2 +
Updates:
Status: Accepted
Labels: Integration
Comment #1 on issue 1869 by asmeurer: integrate(sin(log(x**2))) takes
forever
http://code.google.com/p/sympy/issues/detail?id=1869
It does indeed take forever (and in the end, it can't do it), even if you
set x to be positive,