%% 
%%  Ein Beispiel der DANTE-Edition
%%  
%%  1. Auflage
%% 
%%  Beispiel 15-03-7 auf Seite 777.
%% 
%%  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[]{exaarticle}
\pagestyle{empty}
\setlength\textwidth{142.324pt}
\setlength\parindent{0pt}
\usepackage[utf8]{inputenc}
\StartShownPreambleCommands
\usepackage{pst-plot}
\StopShownPreambleCommands
\begin{document}
\psset{xunit=1.5cm,yunit=1.5cm}
\begin{pspicture}[showgrid=true](-1.1,-1.1)(1.1,1.1)
\psparametricplot[plotstyle=curve,linewidth=1.5pt,
  plotpoints=200,algebraic]{-6.28}{6.28}%
    {sin(1.5*t)|sin(2*t+Pi/3)}
\end{pspicture}
\end{document}