Updates:
Cc: basti.kr
Comment #1 on issue 1851 by asmeurer: Integral((-60*exp(x) -
19.2*exp(4*x))*exp(4*x), x).doit() failure
http://code.google.com/p/sympy/issues/detail?id=1851
The problem is with substitution. Here is what is happening:
In [12]: ((-60*exp(x) - 19.2*exp(4*x))*exp(4*x)).subs(S("{exp(x): _x0, x:
_x1, exp(4*x): _x2}"))
Out[12]:
⎛ 4 ⎽⎽⎽⎽⎽⎞
_x2⋅⎝-19.2⋅_x2 - 60⋅╲╱ _x2 ⎠
But we want exp(x) to be replaced with _x0 and exp(4*x) to be replaced with
_x2, so that the resulting
expression can be made into a Poly. So we need atomic substitution to make
it work.
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