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+%% 
+%%  An UIT Edition example
+%% 
+%%  Example 06-03-13 on page 93.
+%% 
+%%  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{177.70511pt}
+\AtBeginDocument{\setlength\parindent{0pt}}
+\setcounter{equation}{38}
+\renewcommand\theequation{6.\arabic{equation}}
+\StartShownPreambleCommands
+\usepackage{amsmath}
+\StopShownPreambleCommands
+\begin{document}
+\begin{align}
+\begin{split}
+ f(x) &= x                      \\
+ g(x) &= \sinh\left(x^2-1\right)\\
+ h(x) &= \mathrm{atan}\left(\frac{x}
+           {\sqrt{1+x^2}}\right)
+\end{split}
+\end{align}
+\end{document}