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xxx and yyy are functions of a parameter ttt: x=f(t)x=f(t)x=f(t), y=g(t)y=g(t)y=g(t).
Choose a range for the parameter ttt based on the context.
Calculate corresponding values for selected ttt within the range.
Plot points in the order ttt increases to show curve direction.
Connect the points smoothly, indicating direction with an arrow.
Mark intercepts, maxima, minima, and changes of direction.
Set x(t)=0x(t) = 0x(t)=0 or y(t)=0y(t) = 0y(t)=0 and solve for ttt.
x=cos(t)x=\cos(t)x=cos(t), y=sin(t)y=\sin(t)y=sin(t) for ttt in [0,2π][0, 2\pi][0,2π].
x=acos(t)x = a \cos(t)x=acos(t), y=bsin(t)y = b \sin(t)y=bsin(t) for ttt in [0,2π][0, 2\pi][0,2π].
It allows flexible description of curves not easily expressed.
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