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+%%
+%% An UIT Edition example
+%%
+%% Example 05-03-3 on page 74.
+%%
+%% Copyright (C) 2010 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{375.57637pt}
+\setlength\parindent{0pt}
+\setcounter{equation}{1}
+\renewcommand\theequation{5.\arabic{equation}}
+\StartShownPreambleCommands
+\usepackage{xcolor,amsmath,calc}
+\StopShownPreambleCommands
+\begin{document}
+\colorbox{black!20}{%
+\parbox{\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}