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Visual Calculus Precalculus Section: This website provides tutorials for Calculus. However, it also includes a nice PreCalculus
section with piecewise defined functions, even and odd functions, polynomials, rational functions, geometric transformations of functions, algebra of functions, composition of functions, trigonometric functions, exponential functions, inverses, logarithms, parametric equations, polar coordinates, solving
equations, curve fitting, and conic sections.
LSquaredMath.com: Laura Shears has several really nice applications for trigonometry (below is the "Radian Target Practice." Click on "The
Unit Circle" on the left menu. There are also some nice triangle and vector interactive demos.
Famous Curves Index: This lovely website (published in Scotland) has 63 famous curves complete with equations, graphs
(like this nice one of Fermat's Spiral), a short history of the cure, and a line to interactive Java code for manipulating the curve. If you're teaching about parametric equations or polar coordinates, you have to check these out!
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