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Homework Help: Series derivative of sin(kx)

  1. Sep 30, 2012 #1
    Last edited: Sep 30, 2012
  2. jcsd
  3. Sep 30, 2012 #2
    You haven't showed your attempt at a solution, just how you plugged the equation into WolframAlpha.

    I would suggest writing out the first several terms of the infinite series for sin(kx) and taking the derivative of those. From there, the connection to k*cos(kx) should be clear.
  4. Sep 30, 2012 #3
    thank you!
    Last edited: Sep 30, 2012
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