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>> Well, one formula says something like dy/dx = dy/du * du/dx
>
> Yes, but note the use of 'u', which in this case basically represents
> the inner function.
This is one of the more confusing aspects of calculus. The duality
between "functions" and "variables that share a relationship". That and
the multiple notations for the same concept...
I still don't entirely understand what you're saying, but presumably
you're right.
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