Hi everybody,

here is the result of my session on Sage 7.2 beta0 (but I guess the problem is 
not specific to that version)

> sage: var('t')
> t
> sage: integrate(exp(-2*t)/(1-exp(-2*t)),t)
> 1/2*log(e^(-2*t) - 1)


What does mean log(-1+e^(-2*t)) since the argument is negative ?

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