%% 
%%  Ein Beispiel der DANTE-Edition
%%  
%%  2. Auflage
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%%  Beispiel 15-03-26 auf Seite 759.
%% 
%%  Copyright (C) 2016 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
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\documentclass[]{exaarticle}
\pagestyle{empty}
\setlength\textwidth{169.16928pt}
\setlength\parindent{0pt}
\usepackage[utf8]{inputenc}
%StartShownPreambleCommands
\usepackage{pst-func,pstricks-add}
%StopShownPreambleCommands
\begin{document}
\begin{pspicture*}(-3,-2.2)(3.5,2.5)
\psaxes{->}(0,0)(-3,-2)(3.2,2)
\psplotImp[linewidth=2pt,algebraic]%
  (-5,-2.2)(5,2.4){(x^2+y^2)^2-8*(x^2-y^2)}
\rput*(2,1.5){\footnotesize%
  $\left(x^2+y^2\right)^2-8(x^2-y^2)=0$}
\end{pspicture*}
\end{document}
