%% 
%%  A DANTE-Edition example
%% 
%%  Example 36-00-72 on page 797.
%% 
%%  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{pstricks,pst-plot}

\begin{document}
\psset{xunit=0.025cm}
\begin{pspicture}(-30,-2)(425,2)
\psaxes[Dx=30]{->}(0,0)(0,-2)(420,2)
\uput[0](420,0){$\alpha$}\uput[180](0,2.2){$f(\alpha)$}
\psplot[linewidth=2pt,linecolor=green,linestyle=dotted]{0}{390}{x sin}
\psplot[linewidth=1pt,linecolor=blue,linestyle=dashed]{0}{390}{x 2 mul 30 sub sin neg}
\psplot[linewidth=1pt,linecolor=red]{0}{390}{x 2 mul 30 sub sin neg x sin add}
\end{pspicture}
\end{document}