From: Albert_Rich@msn.com   
      
   On Monday, May 21, 2018 at 12:28:53 AM UTC-10, clicl...@freenet.de wrote:   
   > Integrating LN(a + b*x)*LN(c + d*x)/(e + f*x) should belong in the hard   
   > category. Can Rubi now handle the general integrand? Is the evaluation   
   > broken down into comprehensible steps, or does Rubi just rely on one   
   > incomprehensible rule encoding the general result?   
      
   Rubi uses two steps to integrate log(a+b*x)*log(c+d*x)/(e+f*x) wrt x.  First   
   it uses a linear substitution to transform the integrand into the form   
   log(a+b*x)*log(c+d*x)/x.  Then it uses one "incomprehensible" rule to   
   integrate that.  Perhaps you or some    
   other reader knows how to break it down into "comprehensible" steps...   
      
   Albert   
      
   --- SoupGate-Win32 v1.05   
    * Origin: you cannot sedate... all the things you hate (1:229/2)