TeX Quellcode:

\begin{array}{rclll} \mathbb{D} &=& \mathbb{R}\backslash_{\{k \cdot \pi; \; k\in\mathbb{Z}\}} \cr\cr \displaystyle\int \dfrac{1}{\tan(s)} \, ds &=& \displaystyle\int \dfrac{\cos(s)}{\sin(s)}\,ds \end{array}