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Geogebra
Geogebra is a free online math tool for graphing.
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Khan Academy-Algebra
Khan Academy is a non-profit educational organization created in 2008 by Salman Khan with the goal of creating a set of online tools that help educate students. The organization produces short lessons in the form of videos.
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The Great Math Mystery
Join NOVA on a mathematical mystery tour—a provocative exploration of math's astonishing power across the centuries. We discover math's signature in the swirl of a nautilus shell, the whirlpool of a galaxy, and the spiral in the center of a sunflower. It all leads to the ultimate riddle: Is math a human invention or the discovery of the language of the universe?
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The Story of Mathematics
The history of mathematics.