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I Lagrange equation

  1. Oct 28, 2016 #1
    am deriving lagrange's equation can any body help me to understand this identity
    the book says that he is using the chain rule for it but am not getting it
    the identity is in the screen shot
    thanks :)
  2. jcsd
  3. Oct 28, 2016 #2

    Vanadium 50

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    What identity?
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