# Series derivative of sin(kx)

1. Sep 30, 2012

### bossman007

;l;k

Last edited: Sep 30, 2012
2. Sep 30, 2012

### Kolodny

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. Sep 30, 2012

### bossman007

thank you!

Last edited: Sep 30, 2012