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%% 
%%  Ein Beispiel der DANTE-Edition
%% 
%% 
%%  Copyright (C) 2008 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{190.324pt}
\setlength\parindent{0pt}
\StartShownPreambleCommands
\usepackage{pst-func}
\StopShownPreambleCommands
\begin{document}
\psset{xunit=1.25,yunit=0.75}
\begin{pspicture*}(-4,-5)(4,5)  \psaxes{->}(0,0)(-4,-5)(4,5)
  \psset{dotscale=2,dotstyle=x,zeroLineStyle=dotted,zeroLineWidth=1pt}
  \psPolynomial[markZeros,linewidth=2pt,coeff=-1 1 -1 0 0.15]{-4}{3}
  \psPolynomial[markZeros,linecolor=red,linewidth=1pt,linestyle=dashed,
    coeff=-1 1 -1 0 0.15,Derivation=1,zeroLineTo=0]{-4}{3}
  \psPolynomial[markZeros,linecolor=magenta,linewidth=1pt,linestyle=dotted,
    coeff=-1 1 -1 0 0.15,Derivation=2,zeroLineTo=0]{-4}{3}
\end{pspicture*}
\end{document}