Results 1 to 2 of 2

Thread: Integration by parts

  1. #1
    Newbie
    Joined
    Sep 2008
    Posts
    6

    Integration by parts

    Can somebody please show my how to integrate this? I have issues with integrating natural logs. It's the integral of (cosx)ln(sinx)dx. Thanks in advance. You guys are really great to be helping people free of charge.
    Jay
    Follow Math Help Forum on Facebook and Google+

  2. #2
    Super Member
    Joined
    Jun 2008
    Posts
    792
    Quote Originally Posted by HellaciousD View Post
    Can somebody please show my how to integrate this? I have issues with integrating natural logs. It's the integral of (cosx)ln(sinx)dx. Thanks in advance. You guys are really great to be helping people free of charge.
    Jay
    Notice that you can get rid of the cos(x) by substituting z = sinx, where you should get:
    - \int \ln{z}~dz

    It should be obvious what parts you should use for u and dv.
    Follow Math Help Forum on Facebook and Google+

Similar Math Help Forum Discussions

  1. Replies: 2
    Last Post: Jan 11th 2012, 03:30 PM
  2. Replies: 8
    Last Post: Sep 2nd 2010, 01:27 PM
  3. Replies: 0
    Last Post: Apr 23rd 2010, 04:01 PM
  4. Integration by Parts!
    Posted in the Calculus Forum
    Replies: 7
    Last Post: Jan 22nd 2010, 04:19 AM
  5. Replies: 1
    Last Post: Feb 17th 2009, 07:55 AM

Search Tags


/mathhelpforum @mathhelpforum