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%%
%% Ein Beispiel der DANTE-Edition
%%
%% 1. Auflage
%%
%% Beispiel 09-07-45 auf Seite 461.
%%
%% Copyright (C) 2011 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{166.324pt}
\AtBeginDocument{\setlength\parindent{0pt}}
\StartShownPreambleCommands
\usepackage{amsmath}
\StopShownPreambleCommands
\begin{document}
\begin{align*}
\sqrt{\vphantom{b}a}\cdot\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}
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