explain how and when to use chain rule also please.

2. Find the derivatives with respect to the independent variable t for the following functions using the chain rule: Note: You can write dx = = x (i.e., x with a dot on top of it - this is Newton's notation for time derivatives) 2.2.1. f(x(t), t) = (4t2 - x)(+3 - 8+2 + 12)