From: drhuang57@gmail.com   
      
   cannot simplify exp(x)+exp(-x) to cosh(x)? mathHandbook do it by one click the   
   simplify button. and do more:   
   It is an online graphic calculator and computer algebra system. It can perform   
   exact, numeric, symbolic and graphic computation, e.g. any order of   
   derivative, fractional calculus,  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. It can   
   run on iPhone and any    
   mobile with Internet.   
      
   Http://mathHandbook.com    
      
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