%% 
%%  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{166.324pt}
\setlength\parindent{0pt}
\StartShownPreambleCommands
\usepackage{pstricks,pst-plot,pst-eucl}
\StopShownPreambleCommands
\begin{document}
\psset{unit=.75}
\begin{pspicture}[shift=-.5](-3,-4)(3,4)
  \def\F{x 180 mul 3.1415926 div cos 2 mul}
  \pstGeonode(0.3,-1){O}\pstGeonode(2,.5){M}
  \ncline[linecolor=blue, arrowscale=2]{->}{O}{M}
  \psaxes{->}(0,0)(-3,-3)(3,4)
  \psplot[linewidth=2pt]{-3.14}{3.14}{\F}
  \psset{PointSymbol=*}
  \pstCircleOA{O}{M}
  \psset{PointSymbol=o}
  \pstInterFC{\F}{O}{M}{1}{N_0}
  \pstInterFC{\F}{O}{M}{-1}{N_1}
  \pstInterFC{\F}{O}{M}{-2}{N_2}
  \pstInterFC{\F}{O}{M}{2}{N_3}
\end{pspicture}
\end{document}