x=t(adsbygoogle = window.adsbygoogle || []).push({}); ^{2}and y=t^{3}-3t, find dy/dx and d2y/dx2

I understand how to get to dy/dx but an confused on how to get to d2y/dx2 can someone please explain in depth, I know the formula is (d/dt dy/dx)/(dx/dt) I dont understand where d/dt comes from and what it is. why do we not just derive it twice? I really do not understand the 2nd part at all.

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# Parametric equation confusion of d2y/dx2

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