Graphing
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http://insidesearch.blogspot.com/2011/12/showing-some-love-to-math-lovers.html
Google graphs functions: 2D or 3D. Just type function in search bar. Ex: x^2 or x^2 + y^2 Use commas for multiple functions. -
http://www.geogebra.org/cms/en/
Interactive geometry, algebra, statistics, calculus software