↑↑↑   Simple Graph of 3 Functions (±30)   ↑↑↑ CANVAS NOT SUPPORTED IN THIS BROWSER! var F1 = function(X) { let y = 0, x = X * 1.0 ; let a = 0, b = 1, c = 0; y = a * x*x + b * x + c; y = Math.sqrt( 64 - x*x ) ; return y * 1 ; } ; var F2 = function(X) { let y = 0, x = X * 1.0 ; let a = 1/4, b = 0, c = -16; y = a * x*x + b * x + c; return y * 1 ; } ; var F3 = function(X) { let y = 0, x = X * 1.0 ; let d= 0.2, a= 1, b= 1, c= 0; y = d*x*x*x + a*x*x + b*x+c; y = -F1(x) ; return y * 1 ; } ;