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%%
%% An UIT Edition example
%%
%% Example 09-15-3 on page 180.
%%
%% 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
\usepackage{exscale}
\newcommand*\diff{\mathop{}\!\mathrm{d}}
\StopShownPreambleCommands
\begin{document}
\huge
\[\int_{-1}^{+1}\frac{f(x)}{\sqrt{1-x^{2}}}\diff x\approx\frac{\pi}{n}\sum_{i=1}^{n}f
\left(\cos\left(\frac{2i-1}{2n}\right)\right) \]
\end{document}
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