From: drhu...@gmail.com   
      
   what is solution of  y'''-4  y'    -2  y' y =0  ? how to test it by online   
   software?   
   wolfram solution is very complicated, so we cannot test it .   
      
   it has  a very simple solution:   
   http://server.drhuang.com/input/?guess=dsolve%28ds%28y%2Cx%2C3%2   
   -4ds%28y%29-+2ds%28y%29*y%29   
      
   mathHand.com   
      
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