Results 1 to 2 of 2

Math Help - Integration...can anyone help me pls

  1. #1
    Newbie
    Joined
    May 2009
    Posts
    15

    Integration...can anyone help me pls

    Hi. I m finding hard to solve these questions

    1.
    integration of

    (x+1)(x^2 + 2x -5)^(1/2) dx

    2. integration of

    x^2 / (x+2)^3 dx

    3. integration of

    cos^3(x)/sin^3(x) dx

    4. integration of

    (3 − sin(3x)) cos(3x) dx


    thank you so much for your help

    I really appreciate it.
    these questions might be an easy piece of cake ..
    Follow Math Help Forum on Facebook and Google+

  2. #2
    MHF Contributor
    skeeter's Avatar
    Joined
    Jun 2008
    From
    North Texas
    Posts
    11,621
    Thanks
    426
    Quote Originally Posted by mookie View Post
    Hi. I m finding hard to solve these questions

    1.
    integration of

    (x+1)(x^2 + 2x -5)^(1/2) dx

    substitution ... let u = x^2 + 2x - 5

    2. integration of

    x^2 / (x+2)^3 dx

    u = x+2 ... x = u-2 ... du = dx

    (u-2)^2 / u^3 du ... expand the numerator and divide each term by u^3

    3. integration of

    cos^3(x)/sin^3(x) dx

    [1-sin^2(x)]/sin^3(x) * cos(x) dx

    let u = sin(x)


    4. integration of

    (3 − sin(3x)) cos(3x) dx

    3cos(3x) - sin(3x)cos(3x)

    3cos(3x) - (1/2)sin(6x)
    ...
    Follow Math Help Forum on Facebook and Google+

Similar Math Help Forum Discussions

  1. Replies: 3
    Last Post: November 3rd 2010, 12:54 AM
  2. Replies: 2
    Last Post: November 2nd 2010, 04:57 AM
  3. Replies: 8
    Last Post: September 2nd 2010, 12:27 PM
  4. Replies: 2
    Last Post: February 19th 2010, 10:55 AM
  5. Replies: 6
    Last Post: May 25th 2009, 06:58 AM

Search Tags


/mathhelpforum @mathhelpforum