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y=Asin omegat where A and omega are cons...

`y=Asin omegat` where A and `omega` are constants. Find `(d^(2)y)/(dt^(2))`.

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`(dy)/(dt)=Acosomegatxxomega=Aomegacosomegat`
Again, `(d^(2)y)/(dt^(2))=Aomegaxx-sinomegatxxomega=-Aomega^(2).sinomegat`
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