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Someone please explain how did we get second term in equation 2.15.

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  • $\begingroup$ Can you provide the source? $\endgroup$
    – hendlim
    Commented Jul 6 at 15:37
  • $\begingroup$ The "canceling of the dots" stage is the only thing that makes this slightly non-trivial, so I'm not sure if that's what you're asking about, but if you are you can see this question $\endgroup$
    – Amit
    Commented Jul 6 at 15:46

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