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Snapping to Intercept Points & Extreme Points

f(x)=Polynomial({A,B,C,D,E}) list1=Join({{Extremum(f)},{Root(f)},{(0,f(0))}}) P'=Point(f) Q=ClosestPoint(list1,P') d=AxisStepX()/20 P=DynamicCoordinates(P', If(Distance(P',Q)
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