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%%
%% Ein Beispiel der DANTE-Edition
%%
%% Beispiel 15-03-26 auf Seite 783.
%%
%% Copyright (C) 2012 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{118.324pt}
\setlength\parindent{0pt}
\usepackage[utf8]{inputenc}
\usepackage{pst-func,pstricks-add}
\begin{document}
\begin{pspicture*}(-3,-2.2)(3.5,2.5)
\psaxes{->}(0,0)(-3,-2)(3.2,2)
\psplotImp[linewidth=2pt](-5,-2.2)(5,2.4){
/xqu x dup mul def /yqu y dup mul def
xqu yqu add dup mul 2 dup add 2 mul xqu yqu sub mul sub }
\rput*(2,1.5){$\left(x^2+y^2\right)^2-8(x^2-y^2)=0$}
\end{pspicture*}
\end{document}
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