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+%% 
+%%  Ein Beispiel der DANTE-Edition
+%%  Mathematiksatz mit LaTeX
+%%  2. Auflage
+%% 
+%%  Beispiel 05-03-2 auf Seite 81.
+%% 
+%%  Copyright (C) 2012 Herbert Voss
+%% 
+%%  It may be distributed and/or modified under the conditions
+%%  of the LaTeX Project Public License, either version 1.3
+%%  of this license or (at your option) any later version.
+%% 
+%%  See http://www.latex-project.org/lppl.txt for details.
+%% 
+%% 
+%% ==== 
+% Show page(s) 1
+%% 
+%% 
+\documentclass[]{exaarticle}
+\pagestyle{empty}
+\setlength\textwidth{352.81416pt}
+\setlength\parindent{0pt}
+\setcounter{equation}{1}
+\renewcommand\theequation{5.\arabic{equation}}
+\StartShownPreambleCommands
+\usepackage{xcolor,amsmath}
+\StopShownPreambleCommands
+\begin{document}
+\colorbox{black!20}{%
+\parbox{\dimexpr\linewidth-2\fboxsep}{%
+  \begin{align}
+    \frac{I(\alpha )}{I_{0}}=
+    \begin{cases}
+      \sqrt{1-\frac{\alpha}{\pi}+\frac{1}{2\pi}\sin 2\alpha} & \varphi =0\\[0.4cm]
+      \sqrt{2\left(1-\frac{\alpha}{\pi}\right)\left(2+\cos 2\alpha \right)+
+         \frac{3}{\pi}\sin 2\alpha} & \varphi =\frac{\pi}{2}
+    \end{cases}
+\end{align}}}
+\end{document}