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HELP

function f(x) { y = 1/0; return y }
...
aX = -1; bX = 2; aY = -1; bY = 2
Dx = 1; Dy = 1
...
// Con/with Qx=[a,b,..]; Qy=[A,B,..] i punti sono gialli / the points are yellow
// Con/with Q1x,Q1y, Q2x,Q2y, Q3x,Q3y  rossi,celesti,verdi / red,cyan,green
// with QQ1x,QQ1y, QQ2x,QQ2y very little light red,blue

i=0
for(j=0; j < 4e4; j=j+1) {ra=Math.random(); th=Math.random()*3.142/2; xp0=ra*Math.cos(th); yp0=ra*Math.sin(th)
    xp=xp0*xp0-yp0*yp0; yp=2*xp0*yp0; QQ1x[i]=xp; QQ1y[i]=yp; i=i+1}