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Zwiebach Problem 12.9

  1. Nov 8, 2007 #1
    1. The problem statement, all variables and given/known data
    Can someone explain the second equalities on the second (and third) lines of this attachment i.e. the two equalities in which there are curly braces on the RHS.

    2. Relevant equations

    3. The attempt at a solution

    Attached Files:

  2. jcsd
  3. Nov 16, 2007 #2
    The attachment was approved.
  4. Nov 16, 2007 #3
    Ehrenfest, these two equations are very straight-forward and you can do it yourself with no trouble. I suggest you try it again and in the unlikely event that you still don't get it, post your efforts so we can see where you are going wrong.
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