Geogebra |
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GeoGebra is dynamic mathematics software joining arithmetic, geometry, algebra and calculus. In GeoGebra it is possible to do constructions with points, vectors, segments, lines, conic sections as well as functions and change them dynamically afterwards. Also equations and coordinates can be entered directly.
Free online lessons in Geogebra can be found at: http://math247.pbworks.com/Learn-and-Use-GeoGebra
Highly recommended for the production of interactive teaching material as well as personal research and investigations.