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+%% 
+%%  Ein Beispiel der DANTE-Edition
+%% 
+%%  Beispiel 09-07-45 auf Seite 461.
+%% 
+%%  Copyright (C) 2012 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}}
+
+\usepackage{amsmath}
+
+\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}