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function f(x) { y = y = -0.356759*x*x + 9.09177*x - 39.502166; return y } ... aX = 0; bX = 25; aY = -30; bY = 30 Dx = 5; Dy = 5 ... Qx= [ 5, 7, 9, 11, 13, 15, 17, 19, 20 ] Qy= [-1.3,5.4,12.4,15.5,20.9,15.1,14.9,4.9,-2.3 ] ... AX=BX=AY=BY="" ... AAX=aX; BBX=bX; AAY=aY; BBY=bY