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+%% 
+%%  A DANTE-Edition example
+%% 
+%%  Example 12-01-4 on page 141.
+%% 
+%%  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{177.70511pt}
+\setlength\parindent{0pt}
+
+\usepackage{pst-plot}\SpecialCoor
+
+\begin{document}
+\begin{pspicture}(0,-1)(5,1)
+  \psaxes{->}(0,0)(0,-1)(5,1)
+  \psline(0,0)(*Pi {sqrt(abs(cos(x)))})
+  \psline{<->}(*Pi {cos(x)})(*5 {sin(x)*cos(x)})
+\end{pspicture}
+\end{document}