Results 1 to 3 of 3

Math Help - Trig substitution

  1. #1
    Member
    Joined
    May 2008
    Posts
    138

    Trig substitution

     \int \frac{x}{\sqrt{3-x^4}}dx

    \int \frac{x}{\sqrt{\sqrt{3}^2-(x^2)^2}}dx

    x = \sqrt{3}sinx

    dx = \sqrt{3}cosx

    \sqrt{3-(3sin^2\theta)^2}

    \sqrt{3-(1 - 3sin^4\theta)}

    This is where i get stuck.

    Any help is appreciated
    Follow Math Help Forum on Facebook and Google+

  2. #2
    Flow Master
    mr fantastic's Avatar
    Joined
    Dec 2007
    From
    Zeitgeist
    Posts
    16,948
    Thanks
    5
    Quote Originally Posted by silencecloak View Post
     \int \frac{x}{\sqrt{3-x^4}}dx

    [snip]
    If you make the substitution u = x^2 you get a standard form ....
    Follow Math Help Forum on Facebook and Google+

  3. #3
    Member
    Joined
    May 2008
    Posts
    138
    doh

    i need to develop an eye for these sorts of things still

    thanks
    Follow Math Help Forum on Facebook and Google+

Similar Math Help Forum Discussions

  1. Trig Substitution
    Posted in the Calculus Forum
    Replies: 4
    Last Post: October 14th 2010, 08:09 AM
  2. Trig Substitution
    Posted in the Calculus Forum
    Replies: 1
    Last Post: March 7th 2010, 02:19 AM
  3. trig substitution
    Posted in the Calculus Forum
    Replies: 2
    Last Post: October 21st 2009, 04:23 AM
  4. Trig Substitution
    Posted in the Calculus Forum
    Replies: 1
    Last Post: September 24th 2008, 10:21 PM
  5. Trig substitution
    Posted in the Calculus Forum
    Replies: 27
    Last Post: June 16th 2008, 07:55 PM

Search Tags


/mathhelpforum @mathhelpforum