I'm working on an improper integral problem and have come down to a part I don't quite understand. The solutions manual shows....

$\displaystyle \lim$ $\displaystyle \ln|\frac{b-1}{b+1}|$ = $\displaystyle \ln 1$

The limit is being evaluated as b approaches neg. infinity.

I'm having a hard time seeing how this equates and any help would be much appreciated.

Thanks!