1. Oct 13, 2008 #1

   nonechelon

   

   1. The problem statement, all variables and given/known data
   
   1/(u²(a+bu)²) a and b are constants u is the variable
   
   
   2. Relevant equations
   
   
   
   3. The attempt at a solution
   i know im suppose to use substition by parts but i dont know what to use.
   thanks for help in advance

    

   nonechelon, Oct 13, 2008
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3. Oct 13, 2008 #2

   Mark44

   

   Insights Author

   Staff: Mentor

   I'm confused. The title says "Integration by parts". Later on, you said you supposed to use "substitution by parts" which is not a technique I've ever heard of. There's a technique called "substitution".
   
   There's also a technique called "partial fractions" or "partial fraction decomposition" in which you can decompose a complicated rational expression into a sum of simpler rational expressions.
   
   So how are you supposed to do this problem?

    

   Mark44, Oct 13, 2008
4. Oct 13, 2008 #3

   nonechelon

   

   oops i mean integration by parts i dont know why i said substitution.sorry

    

   nonechelon, Oct 13, 2008
5. Oct 13, 2008 #4

   Defennder

   

   Homework Helper

   The best approach would be to decompose the fraction first into it's partial fractions as suggested by Mark44. Then integrate the partial fractions separately.

    

   Defennder, Oct 13, 2008

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