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Can somebody recomend me a software(preferably free) to draw a graphic like this:

diagram

I have downloaded GeoGebra, but it seems I can't use it to draw such a graphic.

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    inkscape is free, and if you're dedicated, it can be used to make graphics such as these. It's inbuilt latex support is a bit poor, but these are things that one gets used to.2012-05-07
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    Also you should be able to draw something like this in GeoGebra2012-05-07
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    Dia is free and should allow this too. http://live.gnome.org/Dia2012-05-07

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