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%%
%% The LaTeX Companion, 3ed
%%
%% Example 11-7-15 on page II-203 in "Ghostbusters\texttrademark ".
%%
%% Copyright (C) 2022 Frank Mittelbach
%%
%% It may be distributed and/or modified under the conditions
%% of the LaTeX Project Public License, either version 1.3c
%% of this license or (at your option) any later version.
%%
%% See https://www.latex-project.org/lppl.txt for details.
%%
\documentclass{tlc3examargin}
\pagestyle{empty}
\setcounter{page}{6}
\setlength\textwidth{183.0pt}
% Shorten the vertical size of the example ...
\AtBeginDocument{%
\setlength\abovedisplayskip{.3\abovedisplayskip}%
\setlength\belowdisplayskip{.3\belowdisplayskip}%
}
%StartShownPreambleCommands
%StopShownPreambleCommands
\begin{document}
\[
\sqrt{ \frac{a+b}{x_j} } \quad
\sqrt{ \frac{a+b}{\smash{x_j}} } \quad
\sqrt{ \frac{a+b}{{}\smash{x_j}} } \quad
\sqrt{ \frac{a+b}{\smash{x_j+b}} }
\]
\end{document}
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