Updates:
Blockedon: -sympy:2010 sympy:2010
Comment #20 on issue 1793 by asmeu...@gmail.com: Integration failure
http://code.google.com/p/sympy/issues/detail?id=1793
With risch_integrate, the exp(-z) is again factored out:
In [83]: print integrate(c*(P2 - P1), t)
(A*c*t - A*(sin(x)**2 + cos(y)**2)*exp(z)*log(t))*exp(-z)
However, one advantage here over the result from before is that the log is
now just log(t), instead of log(c*t) (or log(c*t*exp(z)) as in the OP).
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