1. Limited time only! Sign up for a free 30min personal tutor trial with Chegg Tutors
    Dismiss Notice
Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Homework Help: A complicated integral

  1. Mar 30, 2009 #1
    1. The problem statement, all variables and given/known data

    My answer should not be correct. Right?:uhh:
    Refer to the attachment please.

    2. Relevant equations

    Refer to the attachment please.

    3. The attempt at a solution

    Refer to the attachment please.


    Attached Files:

  2. jcsd
  3. Mar 30, 2009 #2
    Why not do a partial integration?

    x/sqrt[x^2+1] * x^2 dx

    You can integrate x/sqrt[x^2+1] this is proportional to

    So, if you do a partial integration, you'll have to deal with the integral:

    x sqrt[x^2+1]

    where the x comes from the derivative of x^2. But this is then proportional to (x^2+1)^(3/2).
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook