%% %% Ein Beispiel der DANTE-Edition %% Mathematiksatz mit LaTeX %% 3. Auflage %% Beispiel 05-03-3 auf Seite 80. %% Copyright (C) 2018 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[10pt]{screxa} \pagestyle{empty} \setlength\textwidth{352.81416pt} \setlength\parindent{0pt} \setcounter{equation}{1} \renewcommand\theequation{5.\arabic{equation}} \usepackage{libertinust1math} %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}{\uppi}+\frac{1}{2\uppi}\sin 2\alpha} & \varphi =0\\[0.4cm] \sqrt{2\left(1-\frac{\alpha}{\uppi}\right)\left(2+\cos 2\alpha \right)+ \frac{3}{\uppi}\sin 2\alpha} & \varphi =\frac{\uppi}{2} \end{cases} \end{align}}} \end{document}