Graph
Graph - a free application used to draw mathematical graphs in a coordinate system. You can to do some mathematical calculations on the functions
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
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If you are doing math and don't have a TI Programmable Calculator, you are at a disadvantage.
Texas Instruments TI-83 Plus Graphing Calculator; 64 H x 96mm W Screen