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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}