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Homework Help: Integration by Parts.

  1. Oct 13, 2008 #1
    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
  2. jcsd
  3. Oct 13, 2008 #2


    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?
  4. Oct 13, 2008 #3
    oops i mean integration by parts i dont know why i said substitution.sorry
  5. Oct 13, 2008 #4


    User Avatar
    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.
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