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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
    d/dt(∂x/∂q)
    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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