Results 1 to 3 of 3

Math Help - Partial Derivitive Question

  1. #1
    Member
    Joined
    Apr 2009
    Posts
    83

    Partial Derivitive Question

    Having trouble understanding this one:


    r=sqrt(x^2 +y^2)

    and

    x= r cos theta


    show

    dr/dx * dx/dr not = 1

    Attached Thumbnails Attached Thumbnails Partial Derivitive Question-4.jpg  
    Last edited by heatly; March 5th 2011 at 03:59 AM.
    Follow Math Help Forum on Facebook and Google+

  2. #2
    MHF Contributor
    Prove It's Avatar
    Joined
    Aug 2008
    Posts
    10,970
    Thanks
    1011
    Are you asked to show

    \displaystyle \frac{dr}{dx}\cdot\frac{dx}{dr} \neq 1

    or

    \displaystyle \frac{\partial r}{\partial x}\cdot\frac{\partial x}{\partial r} \neq 1?
    Follow Math Help Forum on Facebook and Google+

  3. #3
    Member
    Joined
    Apr 2009
    Posts
    83
    The second one you wrote iam asked to show.


    I actually thought they were both the same meaning,oops.
    I worked it ou now.
    Thanks for your post Prove it.
    Last edited by heatly; March 5th 2011 at 04:01 AM.
    Follow Math Help Forum on Facebook and Google+

Similar Math Help Forum Discussions

  1. Trig Derivitive Question
    Posted in the Calculus Forum
    Replies: 3
    Last Post: November 14th 2010, 01:40 PM
  2. 2nd Order Partial Derivitive
    Posted in the Calculus Forum
    Replies: 4
    Last Post: October 28th 2009, 02:27 PM
  3. Contour Maps, Partial-Derivitive Help
    Posted in the Calculus Forum
    Replies: 0
    Last Post: January 31st 2009, 01:46 PM
  4. Partial Derivitive help
    Posted in the Calculus Forum
    Replies: 1
    Last Post: November 28th 2007, 07:54 AM
  5. Derivitive Question
    Posted in the Calculus Forum
    Replies: 6
    Last Post: March 23rd 2006, 01:41 AM

Search Tags


/mathhelpforum @mathhelpforum