yes, certainly javascript.
E.g if you scroll down
http://www.touchmathematics.org/javascripts/topics/derivatives/main.js?1309284968
you'd see things like
displayObjs.curves.y[4] = TouchMath.curve({
func: function (x) { return 1 / x; },
color: TouchMath.GREEN
});
displayObjs.curves.dy[4] = TouchMath.curve({
func: function (x) { return -1 / (x * x); },
color: TouchMath.GREEN_MED
});
displayObjs.curves.d2y[4] = TouchMath.curve({
func: function (x) { return 2 / (x * x * x); },
color: TouchMath.GREEN_LIGHT
});
defining all these functions that are plotted.
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