GeoGebra
If you love mathematics, then you will love GeoGebra! GeoGebra is a dynamic mathematics software for schools that joins geometry, algebra and calculus.
GeoGebra is an interactive geometry system. You can 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. GeoGebra has the ability to deal with variables for numbers, vectors and points, finds derivatives and integrals of functions and offers commands like Root or Extremum.
There's two ways to use GeoGebra. You can either use the web interface, which works off a Java applet or you can download the software to your desktop. I used the Jawa web interface and it was very fast.
So, if you have young children learning trigonometry and would like to visualize their equations, give GeoGebra a try.
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