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%%  Example 03-03-7 
%%  Copyright (C) 2016 Herbert Voss
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\documentclass[]{screxa}
\pagestyle{empty}
\setlength\textwidth{110.31393pt}

%StartShownPreambleCommands
\usepackage{xcolor}
\everymath{\color{red}\displaystyle}
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\begin{document}
\[
 f(x)=\int\frac{\sin x}{x}\,\mathrm{d}x
\]
Instead of $\frac{\sin x}{x}$
  now with $\frac{\cos x}{x}$:
\[
 g(x)=\int\frac{\cos x}{x}\,\mathrm{d}x
\]
\end{document}
