Kalkules Calculator
Kalkules a graphing scientific calculator can evaluate whole expressions, draw function graphs, calculate with fractions, calculate with polynomials, and can have unlimited number of parentheses in the expression
 
   
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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