Question

Can someone help me figure out the logic behind the differentiation of this term?

Answer 1

It looks like they're using the chain rule, but why?

Answer 2

because V is a function of r

Answer 3

So why does that necessitate the use of the chain rule?

Answer 4

It's been a couple of years since I took calculus, and I know I should know this, but it's not making sense to me.

Answer 5

I keep thinking that I should just take the derivative of V and hold all else steady as constants, but that's partial differentiation.

Answer 6

I'm just not sure how to reason this out.