Examine a curve defined parametrically.[br][list][*]Enter coordinate functions for C(t) = ( X(t) , Y(t) ) at top of window [use variable t].[br][/*][*]Enter ends of parameter interval [Lo,Hi] at bottom of window.[br][/*][/list]

A slider specifies number T for point C(T) to be marked on the curve;[br]animation shows how that point moves as T increases from Lo to Hi.[br][br]A checkbox gives an option for the velocity vector at C(T) to be displayed.