Interactive Mathematics

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There's over 300 easy to understand math lessons.

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Latest articles

New applet: Domain and range investigation

domain and range applet
This interactive applet allows you to explore the concepts of domain and range for several different mathematical functions... more »

Math movie: The exceptional life of Benjamin Banneker

The exceptional life of Benjamin Banneker
Self-taught mathematician and astronomer Benjamin Banneker excelled despite little formal education and prejudice... more »

What's the correct graph of sec(arccos(x))?

What is the graph of y = sec(arccos(x))?
Here we solve another graph mystery - what is the correct domain for y = sec(arccos(x))? And why do different software packages show similar, but different graphs?.. more »

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