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In the epsilon-delta definition of a finite limit, the student gets to select a limit point and epsilon and then adjust left and right deltas to satisfy the definition.
Seven interactive Flash applets that the user may customize for classroom use, with clear instructions included for doing so.
This applet allows the user to draw three dimensional solids with various cross section shapes, including shapes from standard calculus exercises such as squares, rectangles, equilateral triangles

Three historical "Then and Now" modules, on curve drawing, tangent lines, and optimization problems, each explored using interactive Java applets created with Geometers Sketchpad but

Essay giving an overview of the history of the number \(e\), including various ways of obtaining and representing it. References.
Alphabetical list of well-known curves from Astroid to Witch of Agnesi, with graphs, equations, and a short discussion and history of each curve.
Essay giving a brief overview of the history of the trigonometric functions from ancient Babylon and Greece to medieval India and Europe to more modern times. References.
Essay giving a brief overview of the history of the function concept from intimations in ancient Babylonian tables; to consideration of relations beyond single-formula continuous ones by Euler, Fo
Essay giving a brief overview of the history of calculus from ancient Greeks to Cauchy, with dozens of links to biographies of the mathematicians involved, including Archimedes, Newton and Leibniz