Results 1 to 4 of 4

Math Help - integration problem..plz help, I'm clueless...

  1. #1
    KAS
    KAS is offline
    Newbie
    Joined
    Nov 2008
    Posts
    6

    integration problem..plz help, I'm clueless...

    This question is really confusing..I'm frustrated with it..
    evaluate:

    ∫cos^(n)x

    I tried solving it..
    by these two steps:


    ∫cos^(n-1) x. cosx dx

    ∫cos^(n-1) x d(sinx)
    I then stopped..I felt it's becomming more complicated..can ne1 help by giving me an easier way?
    Follow Math Help Forum on Facebook and Google+

  2. #2
    Math Engineering Student
    Krizalid's Avatar
    Joined
    Mar 2007
    From
    Santiago, Chile
    Posts
    3,654
    Thanks
    14
    No! Actually, you're doing well!

    See my signature, that'll feed you up. (Integration by parts.)
    Follow Math Help Forum on Facebook and Google+

  3. #3
    MHF Contributor Mathstud28's Avatar
    Joined
    Mar 2008
    From
    Pennsylvania
    Posts
    3,641
    Quote Originally Posted by KAS View Post
    This question is really confusing..I'm frustrated with it..
    evaluate:

    ∫cos^(n)x

    I tried solving it..
    by these two steps:


    ∫cos^(n-1) x. cosx dx

    ∫cos^(n-1) x d(sinx)
    I then stopped..I felt it's becomming more complicated..can ne1 help by giving me an easier way?
    Note that this will never give you a definite answer, but what is known as a reduction formula. Look it up on Wikipedia.
    Follow Math Help Forum on Facebook and Google+

  4. #4
    KAS
    KAS is offline
    Newbie
    Joined
    Nov 2008
    Posts
    6
    Krizallid..thanx.. ur method seems to be very effective..ill try use it ..
    mathstud yeh.. it doesn't seem to be the type of question where a definite answer will be found..ill try look at what u sed on wiki.it might be useful..

    thanx again ...
    Follow Math Help Forum on Facebook and Google+

Similar Math Help Forum Discussions

  1. Clueless on this proof, please help!!!
    Posted in the Discrete Math Forum
    Replies: 4
    Last Post: June 21st 2010, 12:02 PM
  2. Clueless
    Posted in the Algebra Forum
    Replies: 3
    Last Post: November 24th 2009, 09:20 AM
  3. Replies: 3
    Last Post: November 21st 2009, 06:51 AM
  4. [SOLVED] Matrix problem, a bit clueless
    Posted in the Advanced Algebra Forum
    Replies: 5
    Last Post: September 14th 2008, 04:13 PM
  5. 3x3 eigenvectors. Clueless.
    Posted in the Advanced Algebra Forum
    Replies: 4
    Last Post: April 6th 2008, 09:45 AM

Search Tags


/mathhelpforum @mathhelpforum