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+%%
+%% A DANTE-Edition example
+%%
+%% Example 28-02-4 on page 523.
+%%
+%% 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,pst-func}
+
+\begin{document}
+\psset{xunit=1.25,yunit=0.75}
+\begin{pspicture*}(-4,-5)(4,5)
+ \psaxes[labelFontSize=\scriptstyle]{->}(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}