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-%% 
-%%  An UIT Edition example
-%% 
-%%  Example 04-20-6 on page 70.
-%% 
-%%  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}
-\AtBeginDocument{\setlength\parindent{0pt}}
-\StartShownPreambleCommands
-\newcommand*\diff{\mathop{}\!\mathrm{d}}
-\StopShownPreambleCommands
-\begin{document}
-\[ay^\prime=a\frac{\diff y}{\diff x}\quad c\times v = c\,\frac{\diff s}{\diff t}\quad
-  a = \frac{\diff{^2t}}{\diff{t^2}} \quad \int\!\!\diff y=\int\!\sin(x)\diff x \]
-\end{document}