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HELP

function f(x) { y =  Math.sqrt(x+11)-Math.sqrt(x+5)+Math.sqrt(x-3)-Math.sqrt(x-1); return y }

aX = 0; bX = 10; aY = -5; bY = 5
Dx = 1; Dy = 1

aX=3; bX=4; aY =-1/2; bY = 1/2
Dx = 0.1; Dy = 0.1

aX=3.44; bX=3.46; aY =-0.005; bY = 0.005
Dx = 0.001; Dy = 0.001