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Derive abbreviation of cos(a+summation(b))

  1. Jul 22, 2016 #1
    1. The problem statement, all variables and given/known data
    I want to derive these equations

    2. Relevant equations

    3. The attempt at a solution

    But I don't have any idea how can extend cos(summation) and sin(summation) in form of Bessel function or product of Sin(wmt+phim)
  2. jcsd
  3. Jul 23, 2016 #2


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    Staff: Mentor

    The first step is using cos(x) = Re(eix)
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