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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}
+\def\F{x RadtoDeg dup dup cos exch 2 mul cos add exch 3 mul cos add}
+\def\Fp{x RadtoDeg dup dup sin exch 2 mul sin 2 mul add exch
+  3 mul sin 3 mul add neg}
+\psset{plotpoints=1001,xunit=0.8,yunit=1}
+\begin{pspicture}(-7.5,-1.8)(7.5,3.2)
+  \psaxes{->}(0,0)(-7.5,-1.8)(7.5,3.2)
+  \psplot[linewidth=3\pslinewidth]{-7}{7}{\F}
+  \psset{linecolor=red}\multido{\n=-7+1}{8}{\psplotTangent{\n}{1}{\F}}
+  \psset{linecolor=magenta}%
+  \multido{\n=0+1}{8}{\psplotTangent[linecolor=blue,Derive=\Fp]{\n}{1}{\F}}
+\end{pspicture}
+\end{document}