Results 1 to 4 of 4

Math Help - derivatives question

  1. #1
    Junior Member
    Joined
    Oct 2009
    Posts
    72

    derivatives question

    sin(y)=yx^2-x

    Find y'

    how do i do this?! @_@
    Follow Math Help Forum on Facebook and Google+

  2. #2
    MHF Contributor
    Joined
    Mar 2007
    Posts
    1,240

    Talking

    You'll have to use implicit differentiation.
    Follow Math Help Forum on Facebook and Google+

  3. #3
    Junior Member
    Joined
    Oct 2009
    Posts
    72
    so sin(y)=yx^2-x

    then for y'

    cos(y)(dy/dx)=(x^2(dy/dx)+2xy)-1

    cos(y)(dy/dx)-x^2(dy/dx)=2xy-1

    y' = (2xy-1)/cos(y)-x^2

    uhh doesn't look right... but is it right? lol
    Follow Math Help Forum on Facebook and Google+

  4. #4
    Super Member
    Joined
    Jun 2009
    From
    United States
    Posts
    676
    Thanks
    19
    Quote Originally Posted by break View Post
    so sin(y)=yx^2-x

    then for y'

    cos(y)(dy/dx)=(x^2(dy/dx)+2xy)-1

    cos(y)(dy/dx)-x^2(dy/dx)=2xy-1

    y' = (2xy-1)/cos(y)-x^2

    uhh doesn't look right... but is it right? lol

    It's correct
    Follow Math Help Forum on Facebook and Google+

Similar Math Help Forum Discussions

  1. Question Regarding derivatives
    Posted in the Calculus Forum
    Replies: 4
    Last Post: March 12th 2010, 06:05 PM
  2. Question regarding derivatives
    Posted in the Calculus Forum
    Replies: 4
    Last Post: March 11th 2010, 03:31 AM
  3. Derivatives question
    Posted in the Pre-Calculus Forum
    Replies: 1
    Last Post: January 15th 2010, 10:03 PM
  4. Another second derivatives question. :(
    Posted in the Calculus Forum
    Replies: 3
    Last Post: May 31st 2009, 11:37 AM
  5. Derivatives question
    Posted in the Calculus Forum
    Replies: 3
    Last Post: May 9th 2008, 06:21 AM

Search Tags


/mathhelpforum @mathhelpforum