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%% 
%%  A DANTE-Edition example
%% 
%%  Example 15-01-37 on page 179.
%% 
%%  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=0.75}
\begin{pspicture}(-0.5,-0.5)(5,5)
  \psaxes[Dx=1.5,Dy=0.75,comma]{->}(5,5)
  \psplot[linecolor=red,
    linewidth=3pt]{0}{4.5}%
     {x RadtoDeg cos 2 mul 2.5 add}
  \psline[linestyle=dashed](0,2.5)(4.5,2.5)
\end{pspicture}
\end{document}