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A Developers' Area article about reuse and interoperability of mathematical tools.

This article discusses parameterized knots (polynomial and trigonometric) and includes an interactive gallery of selected knots and their equations.

This ESTEEM module in the Biometrics Category is a collection of workbooks has tools for linear regression, polynomial fit, and chi-square analysis to test whether a data set is in Hardy-Weinberg Equilibrium.
These applets provide interactive student activities to make connections between the graphical and analytical interpretation of "completing the square" and writing the equation of a parabola in general and standard form.

A mathlet that illustrates the relationship between the graphs of the natural sine and cosine curves and the vertical and horizontal coordinates of points on the unit circle.

Flash CS3 (Actionscript 3.0) templates and classes for graphing functions in one variable as well as parametric curves in rectangular or polar coordinates.
Gauss-Kronrod Integration is an adaptation of Gaussian quadrature used on some graphing calculators. This Java applet outlines the mathematical computations involved and visually demonstrates the process the calculator uses to evaluate the integral.

A summary of Volume 3

This mathlet is a function plotter that can plot multiple curves on a single view.
Two applets for giving students some hands-on practice with cycle notation and composition of permutations.