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Homework Help: How is this true?

  1. Mar 3, 2010 #1
    Can anybody tell me how this is true.

    THE FIRST X DOT IS SUPPOSED TO BE SQUARED!!!!
    http://img442.imageshack.us/img442/1264/80680201.jpg [Broken]
    THE FIRST X DOT IS SUPPOSED TO BE SQUARED!!!!


    (I was given an equation and this is the LHS. I had to differentiate it with respect to x (i think) and this is the result, what is where the ... is?) I had to differentiate an equation and show it equaled another. I have got the RHS right, just cant work out how the LHS goes to 2x double dot

    Any help is appreiciated

    I suspect the chain rule is involved
     
    Last edited by a moderator: May 4, 2017
  2. jcsd
  3. Mar 3, 2010 #2
    Hmmm, good question, I can get it if I play with differentials..
     
  4. Mar 3, 2010 #3
    is it even right? please have a play
     
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