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Quick maths question (stationary points)

Discussion in 'General Discussion' started by Six6siX, 29 May 2006.

  1. Six6siX

    Mobster

    Joined: 25 Nov 2004

    Posts: 4,782

    Location: Hertfordshire

    I'm doing questions about stationary points involving functions with two variables, and the first step is finding the partial 1st and 2nd derivatives with respect to x and y. But I also need to find

    df
    dxdy

    where d is the partial derivative symbol...

    My mind is completely blank, someone help meee! :)
     
  2. cookiem0nster

    Gangster

    Joined: 27 Aug 2004

    Posts: 417

    Location: Surrey

    firstly differentiate the equation partially with respect to x alone, so treat y as a constant. Then takes this new result and differentiate partially with respect to y alone, treating x as a constant.

    It doesnt matter which order you do this in, both results will be the same.
     
  3. Six6siX

    Mobster

    Joined: 25 Nov 2004

    Posts: 4,782

    Location: Hertfordshire

    Ah yes, thats the one, cheers dude :)