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I am I finding the derivative for this right??

d = small delta

s(t) = A Cos(wt + d)

s'(t) = -A Sin(wt + d) * w

s'(t) = -Aw Sin(wt + d)

Is it correct to treat all the rest of the varibles as constants??? My text does not give any examples with these.

All so what would make the velocity(s') = 0??

Thanks

Peter

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# Am I doing this right?

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