For the $f(t)=(t^2,t^3)$ function we have \VECTORfunction {\SQUAREfunction}{\CUBEfunction}{\F} \F{4}{\solx}{\Dsolx}{\soly}{\Dsoly} \[ f(4)=(\solx,\soly), f'(4)=(\Dsolx,\Dsoly) \]