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+%%
+%% Der LaTeX-Begleiter, zweite Auflage (September 2005)
+%%
+%% Beispiel 8-7-11 von Seite 520.
+%%
+%% Copyright (C) 2005 Frank Mittelbach, Michel Goossens,
+%% Johannes Braams, David Carlisle, and Chris Rowley
+%%
+%% Uebersetzung: Copyright (C) 2005 Claudia Krysztofiak,
+%% Rebecca Stiels und Frank Mittelbach
+%%
+%% 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.
+%%
+
+\documentclass{lb2exa}
+\pagestyle{empty}
+\setcounter{page}{6}
+\setlength\textwidth{149.4372pt}
+
+\StartShownPreambleCommands
+\usepackage{amsmath}
+\StopShownPreambleCommands
+\begin{document}
+\begin{align*}
+ f_p (x) &= \begin{cases}
+ \frac{1}{\smash[b]{p}} & x = p \\
+ \frac{\strut
+ \smash[t]{\frac{(1 - x)^{\frac{1}{2}}}
+ { x - \sin (x - p) }}}
+ {\sqrt{1 - p} \, \cos (x - p)} & x \neq p
+ \end{cases}
+\end{align*}
+\end{document}