3D Grapher with contour plot

I recently added a 3D Grapher on IntMath.com, here: 3D and Contour Grapher.

It's Flash-based, and you can enter your own 3D function, which requires the variables x and y. The syntax for adding functions is fairly standard. You can enter examples like these:

• x^2+y^2
• e^(x-y)
• sqrt(2x^3+y^2)
• sin(x+y) [trigonometric functions require brackets]

I obtained this mathematical model for an outdoor chair using the interactive:

Its function is z = f(x,y) = x² - y³.

Have a play with the 3D and Contour Grapher and let me know what you think.

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