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Online unit measurement conversion and evaluation of math expressions.
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desmos.come-Tutor Graphic Calculator
Visually graphs functions of x entered in string format.
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Utterly brilliant optical calculator that can interpret and solve any equation.
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webmath.com - 2-12Wolfram Alpha
Computes answers using built-in algorithms and a growing collection of data.
wolframalpha.comXE Currency Converter
Currency and foreign exchange calculations using live, mid-market rates.