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HELP

// ---- f blue, g green, h red, k orange ----
function f(x) { y =  Math.pow(20-2*x, 2) * x  ; return y }
function h(x) { if(x>10) {y = f(x)} else (y=1/0); return y }

aX = 0; bX = 13; aY = 0; bY = 600
Dx = 1; Dy = 50

C1="green"; L1x=[aX,bX]; L1y=[300,300]; Q2x=[0.9071033,6.638888]; Q2y=[300,300]
xx=[5,10]

AX=BX=AY=BY=""
T0=["0",0,-30]; T1=["13",13,-30]; T2=["0",-0.6,0]; T3=["300",-1,300]; T4=["600",-1,600]
T5=["5",5,-30]; T6=["10",10,-30]