From: drhuang57@gmail.com   
      
   semi-differentiated and integrated graphically with MathHand.com   
      
   some functions cannot be differentiated or integrated symbolically, but can be   
   semi-differentiated and integrated graphically in plot2D. e.g.   
   integrate2D numerically and graphically integrate a function on graph. it   
   convert the integrate( ) to the integrates(x=>sin(x)) for integral graph.   
      
   http://drhuang.com/science/mathematics/software/help/example/#plot2d   
      
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