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+%% 
+%%  Ein Beispiel der DANTE-Edition
+%% 
+%% 
+%%  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{190.324pt}
+\setlength\parindent{0pt}
+\StartShownPreambleCommands
+\usepackage{pstricks-add}
+\StopShownPreambleCommands
+\begin{document}
+\begin{pspicture}(-1,-3)(4.75,3)
+ \psaxes{->}(0,0)(-1,-3)(5,3)
+ \psplot[polarplot,linewidth=2pt,
+  algebraic,plotpoints=500]%
+    {0}{6.289}{2*(1+cos(x))}
+ \multido{\r=0.000+0.314}{21}{%
+  \psplotTangent[polarplot,
+   Derive=-2*sin(x),algebraic,
+   arrows=<->]%
+     {\r}{1.5}{2*(1+cos(x))}}
+\end{pspicture}
+\end{document}