%% 
%%  A DANTE-Edition example
%% 
%%  Example 15-03-9 on page 209.
%% 
%%  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{pst-plot}

\begin{document}
\psset{yunit=4cm,xunit=1cm}
\begin{pspicture}(-5.75,-1)(5.75,1.1)\psaxes{->}(0,0)(-5.5,-.1)(5.5,1.1)
  \psplot[algebraic,plotpoints=51,linewidth=1.5pt,
    showpoints=true]{-5}{5}{IfTE(x<-1.0,-sin(x+1),IfTE(x<1.0,(1-x^2)/2,sin(x-1)))}
  \uput*[90](0,0.5){$y=\frac{1-x^2}{2}$}
  \uput[90](2.6,1){$y=\sin (x-1)$}\uput[90](-2.6,1){$y=-\sin (x+1)$}
\end{pspicture}%
\end{document}