Hi everybody, I have two questions: 1)- 2)- Thank you anyway.

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Originally Posted by lehder Hi everybody, I have two questions: 1)- 2)- Thank you anyway. As before, use L'Hopital's rule. The derivative of sin(Kx) is K cos(Kx) and the derivative of x is 1. The limit is . The derivative of 1- cos(Kx) is K sin(Kx) and the derivative of is 2x. Since those both go to 0, do it again.

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