From: Albert_Rich@msn.com   
      
   On Friday, March 24, 2017 at 6:03:19 PM UTC-10, oldk...@gmail.com wrote:   
   > Off topic a little, I find it interesting that Rubi fails Timofeev 493,   
   >   
   >      int(x^2/(x*cos(x)-sin(x))^2,x)  --> (cos(x) + x*sin(x))/(x*cos(x) -   
   sin(x))   
   >   
   > A pure transcendental function, and easy to solve by heuristic   
   > methods.   
      
   I'm a little slow.  What is the heuristic method used to integrate it?   
      
   Albert   
      
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