\SUBTRACTfunction{\SQUAREfunction}{\ONEfunction}{\Xpart}
\SUBTRACTfunction{\CUBEfunction}{\IDENTITYfunction}{\Ypart}
\PARAMETRICfunction{\Xpart}{\Ypart}{\myparfunction}
\centering
\setlength{\unitlength}{1cm}
\begin{Picture}(-3.5,-6.5)(3.5,6.5)
\cartesiangrid(-3,-6)(3,6)
\pictcolor{blue}
\PlotParametricFunction\myparfunction{-2}{-1}
\PlotParametricFunction\myparfunction{-1}{-0.57735}
\PlotParametricFunction\myparfunction{-0.57735}{0}
\PlotParametricFunction\myparfunction{0}{0.57735}
\PlotParametricFunction\myparfunction{0.57735}{1}
\PlotParametricFunction\myparfunction{1}{2}
\Put[E](3,6){$\begin{matrix}x=t^2-1\\y=t^3-t\end{matrix}$}
\end{Picture}
\qquad
\begin{Picture}(-3.5,-6.5)(3.5,6.5)
\cartesiangrid(-3,-6)(3,6)
\pictcolor{orange}
\PlotParametricFunction[5]\myparfunction{-2}{2}
\Put[E](3,6){$\begin{matrix}x=t^2-1\\y=t^3-t\end{matrix}$}
\end{Picture}
