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HELP

When x < 0 and n is odd, Math.pow(x,1/n) is not defined, but x^1/n is defined (and is calculated by calculator).
We must define Pot(x) = -Math.pow(-x,1/n).
We can increase the number of points (n) to better visualize the almost vertical strokes.

function Pot(x) { if(x>=0) {y = Math.pow(x,1/5)} else {y = -Math.pow(-x,1/5) }; return y }
function f(x) { y = Pot( x*x*(x+1)/((1+x*x)*(x+3)) ); return y }
...

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n=8*9*5*7*11*111