Comment #3 on issue 3262 by [email protected]: CSE loses factor of I (imag. unit)
http://code.google.com/p/sympy/issues/detail?id=3262
I'll put up a pull request that gives new_expr as (a0 + I*x0)*exp(I*atan2(x0, -a0)) and
(-I*x).subs(-x,2)
2*I
(-8*I*x).subs(-2*x,1)
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