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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
    5958575700_1469177061.png

    2. Relevant equations


    3. The attempt at a solution

    2388261400_1469177061.jpg
    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

    mfb

    User Avatar
    2016 Award

    Staff: Mentor

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