%% 
%%  A DANTE-Edition example
%% 
%%  Example 15-03-4 on page 206.
%% 
%%  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{153.70511pt}
\setlength\parindent{0pt}
\AtBeginDocument{%
  \psset{mathLabel=false,labelFontSize=\small}}

\usepackage{pst-plot}

\begin{document}
\psset{unit=1.5cm}
\begin{pspicture}[showgrid](-1.1,-1.1)(1.1,1.1)
  \parametricplot[plotstyle=curve,algebraic,
    linewidth=1.5pt,plotpoints=200]{-6.28}{6.28}%
    {sin(1.5*t) | sin(2*t+Pi/3)}
\end{pspicture}
\end{document}