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-%%
-%% A DANTE-Edition example
-%%
-%% Example 30-04-8 on page 607.
-%%
-%% 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{201.70511pt}
-\setlength\parindent{0pt}
-
-\usepackage{pstricks-add}
-
-\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}