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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}
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