It is an online graphic calculator and computer algebra system. It can perform   
   exact, numeric, symbolic and graphic computation, e.g. arbitrary-precision   
   calculation, solve equation, plot data and user-defined functions, linear   
   regression, symbolic    
   differentation and integration, pattern-match. It is a programming language,   
   in which you can define conditional, case, piecewise, recursive, multi-value   
   functions and procedures, derivatives, integrals and rules.   
      
   Http://www.mathHandbook.com   
      
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