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+%%
+%% A DANTE-Edition example
+%%
+%% Example 30-04-11 on page 610.
+%%
+%% Copyright (C) 2011 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[]{article}
+\pagestyle{empty}
+\setlength\textwidth{375.57637pt}
+\setlength\parindent{0pt}
+
+\usepackage{pstricks-add}
+\def\Lissa{t dup 2 RadtoDeg mul cos 3.5 mul exch 6 mul RadtoDeg sin 3.5 mul}
+
+\begin{document}
+\psset{unit=0.75cm}
+\begin{pspicture}(-4,-5)(4,5)% secant gradient
+ \parametricplot[plotpoints=500,linewidth=1.5pt]{0}{3.141592}{\Lissa}
+ \multido{\r=0.000+0.314}{11}{%
+ \psplotTangent[arrows=<->,linecolor=black!40]{\r}{1.5}{\Lissa}}
+ \multido{\r=0.157+0.314}{11}{%
+ \psplotTangent[arrows=<->,linecolor=black!40]{\r}{1.5}{\Lissa}}
+ \rput(0,4.5){secant gradient}
+\end{pspicture}\hfill%
+%
+\def\LissaAlg{3.5*cos(2*t)|3.5*sin(6*t)}
+\def\LissaAlgDer{-7*sin(2*t)|21*cos(6*t)}
+\begin{pspicture}(-4,-5)(4,5)% tangent gradient
+ \parametricplot[algebraic,plotpoints=500,
+ linewidth=1.5pt]{0}{3.141592}{\LissaAlg}
+ \multido{\r=0.000+0.314}{11}{%
+ \psplotTangent[algebraic,arrows=<->,linecolor=black!40]{\r}{1.5}{\LissaAlg} }
+ \multido{\r=0.157+0.314}{11}{%
+ \psplotTangent[algebraic,arrows=<->,linecolor=black!40,%
+ Derive=\LissaAlgDer]{\r}{1.5}{\LissaAlg} }
+ \rput(0,4.5){tangent gradient}
+\end{pspicture}
+\end{document}