TeX Quellcode:

\begin{array}{rclll} \displaystyle\int \limits_0^{\frac{\pi}{4}} \dfrac{\sin(x)}{\cos(x)} \, dx &=& -\left[\ln\left(\left|\cos(x)\right|\right)\right]_0^{\frac{\pi}{4}} \cr\cr &=& -\ln\left(\left|\cos\left({\dfrac{\pi}{4}}\right)\right|\right) - \left(-\ln\left(\left|\cos\left(0\right)\right|\right)\right) \cr\cr &\approx& 0{,}35 \end{array}