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Parseval - how to go from complex to real coefficients?

  1. Oct 4, 2011 #1
    1. The problem statement, all variables and given/known data
    I'd like to use Parseval's equation to somehow express [itex]\sum a^{2}_{k}[/itex]

    2. Relevant equations
    At the bottom they have done that, but I'm not sure how they went from complex to real coefficients.
    No idea where they got the [itex]a^{2}_{0}[/itex] from too.

    3. The attempt at a solution
    Any ideas would be appreciated.
    Last edited: Oct 4, 2011
  2. jcsd
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