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HELP

function f(x) { y =  Math.pow(2,x)  ; return y }       // F1
function g(x) { y = Math.pow(x,3)-1; return y }        // F2
function h(x) { y = 3+4/x+1/Math.pow(x,3); return y }  // F3
function k(x) { y = (3+x)/(x-4); return y }            // F4
aX = -10; bX = 10; aY = -10; bY = 10
Dx = 1; Dy = 1
xx=[-10,-5,5,10]; yy=[-5,5,10]
T1=["F1",0.5,2.5]; T2=["F2",1.8,0.5]; T3=["F3",-3.5,2.5]; T4=["F4",1.5,-3.5]
T5=["x",9.5,0.5]; T6=["y",-0.5,9.5]