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This website has a really good free downloadable calculator for graphing. It's 3D graphs in particular are of a much better standard than you would get in handhelds.
love this part of the site:http://www.graphcalc.com/y2k.shtml
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I used to use gbplot.http://www.garybeene.com/free/gbplot.htm
In mathematics, you don't understand things. You just get used to them.
If it ain't broke, fix it until it is.
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