%%
%% An UIT Edition example
%%
%% Example 06-11-6 on page 106.
%%
%% 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{amsmath}
\StopShownPreambleCommands
\begin{document}
\begin{align*}
\sqrt{\vphantom{b}a}\times\sqrt{b}
&= \sqrt{ab} \\
\frac{\sqrt{a}}{\sqrt{b}}
&= \sqrt{\frac{a}{b}} \tag{$\bullet$}\\
a\sqrt{b} & =\sqrt{a^2 b}
\end{align*}
\end{document}
