Wikipedia:Sandbox
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\begin{document} \begin{equation} \begin{split} 1+2+3 & = (1+2)+3 \\ & = 1+(2+3) \quad \text{[Assoziativgesetz]} \\ & = 6 \end{split} \end{equation} \begin{equation} \int\limits^{b}_{a} f(x) dx \end{equation} \begin{equation} \sum\limits^{10}_{i=1} = \end{equation} \begin{equation} \left( \begin{array}{cc} a & b\\ c & d \end{array} \right) \sin x \end{equation} \end{document}