### Overview

In this session we apply the main formula to a product of two functions. The result is a rule for writing the derivative of a product in terms of the factors and their derivatives.

### Lecture Video and Notes

#### Video Excerpts

Clip 1: Introduction of Product and Quotient Rules

Clip 2: Introduction to General Rules for Differentiation

### Recitation Video

#### Product Rule

### Worked Example

Smoothing a Piecewise Polynomial