%% 
%%  An UIT Edition example
%% 
%%  Example 04-03-4 on page 36.
%% 
%%  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}}
\StartShownPreambleCommands

\StopShownPreambleCommands
\begin{document}
$a\sqrt{x}+b\sqrt{y}+c\sqrt{z}$\\
$a\sqrt{\vphantom{y}x}+b\sqrt{\vphantom{x} y}
  +c\sqrt{\vphantom{y}z}$\\
$a\sqrt{\vphantom{yl}x}+b\sqrt{\vphantom{l} y}
  +c\sqrt{\vphantom{yl}z}$\\
$a\sqrt{x}+b\sqrt{\smash{y}}+c\sqrt{z}$
\end{document}
