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Need a computation? Among these sites are math, science, engineering, and other free calculators and graphing tools.
A variety of math calculators from mathportal.org
Math solver with steps at cymath.com
Scientific Equation search and solver at symbolab.com
Free problem solver and higher level math calculators from emathhelp.net
Free engineering and math calculators from calculatoredge.com (multilingual)
Free science, math, finance, and other useful calculators from calculatorsoup.com
Webcomic #10 - Clever Lil' Devil ("Little Satan Plays with his new calculator") 12-19-11 (click lower right corner of image)
Free online math graphing calculator at desmos.com
Graph parametric and polar functions at fooplot.com
Free online graphing tools and calculators at numberempire.com
Trigonometry and Geometry calculators and solvers from analyzemath.com
Here is a Computational Knowledge Engine at wolframalpha.com
Here is a useful online math reference - find calculators at rapidtables.com
Experiment with this utility| an online 3-D Function Grapher from livephysics.com