TeX Quellcode:

\begin{array}{ccl} \dfrac{\ln\left(u^5\right)}{5} &=& \dfrac{1}{5}\ln\left(u^5\right) \cr\cr &=& \ln \left(\left(u^5\right)^\frac{1}{5}\right) \cr\cr &=& \ln\left(\sqrt[5]{u^5}\right) \cr\cr &=& \ln(u) \end{array}