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HELP

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

aX = -100; bX = 100; aY = -5; bY = 5
Dx = 10; Dy = 1

aX = 0; bX = 30; aY = -3; bY = 3
Dx = 5; Dy = 1

aX = 20; bX = 25; aY = -1; bY = 1
Dx = 1; Dy = 1/2

aX = 23.4; bX = 23.5; aY = -0.01; bY = 0.01
Dx = 0.01; Dy = 0.005