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+%%
+%% Ein Beispiel der DANTE-Edition
+%%
+%% 7. Auflage
+%%
+%% Beispiel 29-03-5 auf Seite 641.
+%%
+%% Copyright (C) 2016 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{145.16928pt}
+\setlength\parindent{0pt}
+%StartShownPreambleCommands
+\usepackage{pstricks-add}
+%StopShownPreambleCommands
+\begin{document}
+\def\Func{10 x div}\psset{unit=0.75}
+\begin{pspicture}(-0.5,-0.5)(6.25,6.5)
+ \psaxes[arrowscale=1.5]{->}(6.25,6.25)
+ \psplot[linewidth=2pt,algebraic]{1.6}{5}{10/x}
+ \psplotTangent[linewidth=.5pt,linecolor=red,
+ algebraic]{3}{2}{10/x}
+ \psplotTangent[linewidth=.5pt,linecolor=blue,
+ algebraic,Derive=(x*x)/10]{3}{2}{10/x}
+ \psline[linestyle=dashed](!0 /x 3 def \Func)%
+ (!3 /x 3 def \Func)(3,0)
+\end{pspicture}
+\end{document}