Series derivative of sin(kx)

  • Thread starter bossman007
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  • #1
bossman007
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;l;k
 
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  • #2
Kolodny
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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.
 
  • #3
bossman007
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thank you!
 
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