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%%
%% An UIT Edition example
%%
%% Example 10-09-13 on page 222.
%%
%% 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{amsmath} \newcommand*\CMD[1]{\texttt{\textbackslash#1}}
\newcommand*\aboxed[2]{\rlap{\boxed{#1#2}}\phantom{\hskip\fboxrule\hskip\fboxsep#1}}
\StopShownPreambleCommands
\begin{document}
\begin{align*}
F &= \vec\nabla\Phi \\
&= \frac{\partial\Phi}{\partial x}\hat\imath + [\ldots] \\
&= (3x^3+y)\hat\imath + [\ldots] \\
\aboxed{F}{= 20\hat\imath + [\ldots]} \tag*{\CMD{aboxed}}\\
\boxed{F=20\hat\imath + [\ldots]} \tag*{\CMD{boxed}}\\
\rlap{\boxed{F=20\hat\imath + [\ldots]}} \tag*{\CMD{rlap}\{\CMD{boxed}\}}\\
\aboxed{F}{= 20\hat\imath + [\ldots]} \tag*{\CMD{aboxed}}\\
\ldots &= \ldots
\end{align*}
\end{document}
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