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%%
%% An UIT Edition example
%%
%% Example 10-04-2 on page 204.
%%
%% 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{201.70511pt}
\AtBeginDocument{\setlength\parindent{0pt}}
\StartShownPreambleCommands
\usepackage{calc}
\StopShownPreambleCommands
\begin{document}
\[
z =\;\;\underbrace{%
\makebox[\widthof{~$x^2+y^2$}][r]{%
$\sqrt{x^2+y^2}$}}_{\scriptstyle=z^2}
\]
\end{document}
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