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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.

Collection of nine video lectures on double integration, together with supporting notes and problem sets.
Displays regions of integration in the plane for both rectangular and polar coordinates.
Works out solution of a simple flux integral problem, together with commentary
Euler was the first person to recognize that mixed second partial derivatives are equal (in general) -- except that he discussed differentials instead.