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What is a good graphing software ? The one that has the ability to accept an equation (linear, quadratic, etc.) from users and output a graph for that equation (software equivalnet of T1-84 graphing calculator).

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    I use gnuplot often. It's not very good but it's free and dependable! http://www.gnuplot.info/ I'm an ex-TI-81-user turned perl-programmer so take this suggestion with some salt or sugar if you please.2011-09-30

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