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HELP

function f(x) { y = 1/0; return y }

aX = -4; bX = 8; aY = -1; bY = 11
Dx = 1; Dy = 1

xx=[5]; yy=[5,10]
C1=C2 = "blue"; C3 = "green"
L1x = [0,10*Math.cos(112*Math.PI/180)]; L1y = [0,10*Math.sin(112*Math.PI/180)]
L2x = [0,7*Math.cos(0*Math.PI/180)]; L2y = [0,7*Math.sin(0*Math.PI/180)]
L3x = [L1x[0]+L2x[0],L1x[1]+L2x[1]]; L3y = [L1y[0]+L2y[0],L1y[1]+L2y[1]]
Px=Py=[0]; Q2x = [L1x[1],L2x[1]]; Q2y = [L1y[1],L2y[1]]; Q3x = [L3x[1]]; Q3y = [L3y[1]]

AX=BX=AY=BY=""
AY=["dir="+Math.atan(L3y[1]/L3x[1])/Math.PI*180+"^"]
BY=["F="+Math.sqrt(L3x[1]*L3x[1]+L3y[1]*L3y[1])+" kg"]