Issue 1161: Wrong result if calling Basic.subs() with a dictionary
http://code.google.com/p/sympy/issues/detail?id=1161
Comment #2 by tetaberta:
Problem is imho on the first line
result = (-c_ + (-e_/a_)**(1/d_))/b_
result.subs(d_, 0.4) -> (-c_ + I*e_**2.5*(1/a_)**2.5)/b_
Here (-e_/a_)**(1/0.4) is expanded to I*e_**2.5*(1/a_)**2.5 which is not
correct
This has already been reported in issue 896.
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