1. The problem statement, all variables and given/known data The problem is ∫e^x/(e^x)-1 to be evaluated from -1 to 1. 2. Relevant equations 3. The attempt at a solution I got the integral as ln|(e^x)-1| So, for the first part, evaluating from -1 to 0, with t being the limit at 0 I got this: ln|(e^t)-1| - ln|(e^-1)-1| which is supposed to evaluate to negative infinity, and I don't understand that t is approaching 0, so e^t should be 1, 1-1 is 0, and ln0 doesn't exist and (e^-1)-1 is also negative which doesnt exist, so I'm a little confused as to how it works out to negative infinity. Can anyone point me in the right direction? Thanks.