From: &noreply@axelvogt.de   
      
   On 07.12.2013 00:51, Albert Rich wrote:   
   > On Friday, November 29, 2013 3:34:13 PM UTC-10, Nasser M. Abbasi wrote:   
   >   
   > ...  A simpler example of the same bug is   
   >     Assuming[t>0, Int[Sqrt[(I+1)*(1+t+t^4)], t]]   
   > It occurs when t>0 because Rubi uses algebraic simplification to transform   
   the problem to   
   >     Assuming[t>0, Int[Sqrt[I+1]*Sqrt[1+t+t^4], t]]   
   ...   
   > The just released version 4.4 of Rubi resolves the bug by splitting the   
   factors of the square-root and pulling the resulting constant factor out of   
   the integrand in a single step, yielding the guaranteed simpler problem   
   ...   
   > Note that Rubi 4.4 is still not able to find a closed-form antiderivative   
   for the above integrand or for your example.   
      
   Still curious: _is_ there a 'closed' form?   
      
   Maple 17 answers by a complicated expression by   
   using Elliptic E and F (and roots of the quadric).   
      
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