Results 1 to 3 of 3

Math Help - May I ask one thing about a integration question?

  1. #1
    Member
    Joined
    Nov 2012
    From
    London
    Posts
    81

    May I ask one thing about a integration question?

    Hi.

    This is a definite integration question [0.1/10]
    The questions is = {1 / root1-3x^2)}dx


    I did first
    for the integrand 1 / root(1-3x^2), substitute u = root3 x , du = root3 dx ..


    = 1/root3 * 1/root(1-u^2) du

    1/root(1-u^2) = sin^1(u)



    Then, [sin^-1(u) / root3] 1~1/10


    = [sin^-1(root3 x) / root3] 1~ 1/10


    = sin^-1(root3 /10) / root3



    May I ask when I am wrong?
    Please help me out
    Follow Math Help Forum on Facebook and Google+

  2. #2
    Member
    Joined
    Nov 2013
    From
    Australia
    Posts
    192
    Thanks
    40

    Re: May I ask one thing about a integration question?

    Is 1-3x^2 all under the square root? Sorry, I can see it is.
    Follow Math Help Forum on Facebook and Google+

  3. #3
    Member
    Joined
    Nov 2013
    From
    Australia
    Posts
    192
    Thanks
    40

    Re: May I ask one thing about a integration question?

    Then, [sin^-1(u) / root3] 1~1/10

    I think that you are right up to here except that 1 and 0.1 are x values you have to get the equivalent u values.
    does that make sense ?
    Follow Math Help Forum on Facebook and Google+

Similar Math Help Forum Discussions

  1. Replies: 1
    Last Post: November 28th 2013, 10:26 PM
  2. Replies: 1
    Last Post: December 6th 2009, 11:00 PM
  3. Replies: 1
    Last Post: May 16th 2009, 05:09 AM
  4. Another Integration thing
    Posted in the Calculus Forum
    Replies: 2
    Last Post: December 31st 2008, 04:02 PM
  5. is there such a thing ??
    Posted in the Calculus Forum
    Replies: 12
    Last Post: April 29th 2008, 11:42 AM

Search Tags


/mathhelpforum @mathhelpforum