I am trying to do an integration like this:


Ultimately the result I should be able to get is -log(1-z)

Manual integration shows that you can integrate(1/(1-z),z) -> -log(z-1), 
evaluation at the limits yields -log(z-1) - (-log(-1)) which you can 
simplify to -log(1-z).  How can I tell sympy to delay evaluation until 
after it has done the simplification?  I guess that it first does log(-1), 
which it isn't happy about...

Ian

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