While solving an equation, the lecturer was using substitution in this video:(adsbygoogle = window.adsbygoogle || []).push({});

x=au was subbed in for Psi at timestamp 39:27

d/dx = (1/a)(d/du). I get that.

But then the second derivative is stated as being

d2/dx2 = (1/a2)(d2/du2)

How is it (1/a2) if we do not know if there is an "a" in the function "u"?

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# I Chain rule found in MIT video

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