Nasser M. Abbasi  wrote:   
   >   
   > Why FriCAS gives zero on this integral?   
   >   
   >                       FriCAS Computer Algebra System   
   >                             Version: FriCAS 1.3.6   
   >                  Timestamp: Mon 09 Mar 2020 12:35:03 PM CDT   
   >   
   > (1) -> integrate(cos(x)*cos(2*x)*sin(3*x)/(-5+4*sin(x)^2)^(5/2),x)   
   >   
   >    (1)  0   
   >   
   > This is #425 in Timofeev test suite. No error or any other message is given.   
      
   Looks like a bug.  Note that integral is written as real thing, but   
   expression under square root is always negative on real axis, AFAICS   
   this triggers bug.   
      
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