because some graphs that have the “many to one” situation aren’t necessarily going to be functions; There may be other places (i.e. a couple of other coordinate points) that connect vertically, therefore disqualifying it as a function. These “rules” can also bedifficult to remember...
A cubic Bézier easing function is a type ofeasing functiondefined by four real numbers that specify the two control points,P1andP2, of a cubic Bézier curve whose end pointsP0andP3are fixed at (0,0) and (1,1) respectively. Thexcoordinates ofP1andP2are restricted to the range [0,1]....