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%%
%% An UIT Edition example
%%
%% Example 05-03-4 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{153.70511pt}
\setlength\parindent{0pt}
\StartShownPreambleCommands
\usepackage{xcolor,empheq}
\StopShownPreambleCommands
\begin{document}
\begin{empheq}[box=\fcolorbox{blue}{cyan!40}]{align*}
x(t) & =\frac{a\left(t^{2}-1\right)}{t^2+1}\\
y(t) & =\frac{at\left(t^{2}-1\right)}{t^2+1}
\end{empheq}
\end{document}
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