Evaluate
\left\{\begin{matrix}\text{Indeterminate},&\left(u>0\text{ and }b<0\right)\text{ or }\left(b>0\text{ and }u<0\right)\\\ln(|b|)-\ln(|u|),&\left(u>0\text{ and }u<b\right)\text{ or }\left(b<0\text{ and }u<b\right)\text{ or }b=u\\\infty,&\left(b=0\text{ and }u>0\right)\text{ or }\left(u=0\text{ and }b>0\right)\\-\infty,&\left(u=0\text{ and }b<0\right)\text{ or }\left(b=0\text{ and }u<0\right)\\\ln(|u|)-\ln(|b|),&\left(b>0\text{ or }u<0\right)\text{ and }b<u\end{matrix}\right.
Differentiate w.r.t. u
\text{Indeterminate}
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