From: fateman@cs.berkeley.edu   
      
   On 10/30/2016 9:41 PM, Dr Huang wrote:   
   > i fix it. you can input   
   > integrate x*f(x)   
   > to www.mathHandbook.com, hit the ENTER key in your keyboard or click the =   
   button   
   >   
   Click bait in sci.math.symbolic?  Ok I bit.   
      
   Indeed you can type it in, but you get the answer in terms of   
   derivatives of order -2 and -1.   
     In other words, in terms of more complicated integrals.   
   What's this worth?   
      
   ∫x⋅f(x) dx∫x⋅f(x) dx == ((−d−2/dx−2 ) f(x))+(d−1/dx−1)    
   f(x)⋅x   
      
   --- SoupGate-Win32 v1.05   
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