Math 201 Lecture 20 - Related Rates part 3 and Linear Approximation and differentials

In this lecture, we finish related rates by doing one more example and then move onto linear approximation and differentials. After going through the theory very nonchalantly and informally, we do a few examples to end the lecture. With the end of this lecture, we end section 2.8 in Stewart's Essential Calculus, 2nd ed.