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Provides a simple visualization of the polar to rectangular "change of coordinates" by displaying a polar rectangle adjacent to its mapping into rectangular coordinates, together with explanatory
This java applet provides a variety of graphing functionality supporting multivariable calculus.
Interactive java applet which allows the user to plot any two- or three-dimensional parametric curve together with associated tangent and normal vectors.

This is a collection of images and animations of various concepts in multivariable calculus, including a plane tangent to a sphere, a function with two local maxima but no local minimum, and a

Collection of worksheets for use with Sage, covering differentiation, graphing functions, line integrals, and optimization.

Webpage describing how Kepler's Laws apply to binary stars, with supporting figures and equations.
Allows the user to "fire" projectiles on a 2D graph. User may adjust the initial velocity and angle, the mass of the projectile, and air resistance. Provides several languages.
Set eccentricity and watch the planet move around. Illustrates Kepler's second law by clearly showing how velocity varies at different points of an elliptical orbit.

Displays a quadratic surface and provides students with practice identifying the type of surface as well as its equations. Also has optional stereographic display.