I started to learn calculus following a book but I donít understand the explanation of a derivative example. Here is the excerpt of the book:
Then the Pythagorean theorem tells us that
h(t)^2 + b(t)^2 = 13^2
We may differentiate both sides of this equation with respect to the variable t
(which is time in minutes) to obtain
2 ∑ h(t) ∑ hí(t) + 2 ∑ b(t) ∑ bí(t) = 0
It seems that the author applied the Chain Rule but I am not sure about the intermediary steps of this differentiation. Could someone show me the intermediary steps and explain them if needed ?