\setlength{\unitlength}{0.5cm}
\begin{center}
\begin{Picture}(-11,-11)(11,11)
\cartesianaxes(-10,-10)(10,10)
\PRODUCTfunction{\IDENTITYfunction}{\COSfunction}{\Gfunction}
\pictcolor{red}
\PlotFunction[30]{\Gfunction}{-10}{10}
\end{Picture}
\end{center}
