LESSON NOTES MENU
 
Course: Calculus I
Topic: Derivatives
Subtopic: Chain Rule

Overview

Functions such as `sinsqrtx` have an "inside" function, `sqrtx`, and an "outside" function, the sine function. Such functions are really a composition of two functions, e.g. `f(x)=sinx`, `g(x)=sqrtx`, `h(x)=sin sqrtx=(f @ g)(x)`. The chain rule is used for finding derivatives of composed functions, functions where there is one function inside another.

When you have multiple composed functions, it is helpful to start with the very inside function and work your way out or visa versa. Get in the habit of going one direction and sticking to it else taking the derivative of something like `y=sqrt(sin(e^cos(x^3)))` becomes error prone!

Objectives

By the end of this topic you should know and be prepared to be tested on:

Terminology

Terms you should be able to define: chain rule, inside vs. outside of a composed function

Text Notes

It is extremely important to be able to use the chain rule accurately. Practice, practice, practice!

Mini-Lectures and Examples

STUDY: Derivatives - Chain Rule

Supplemental Resources (optional)

Supplemental Resources (optional)

Video: Leibniz Notation and the Chain Rule, Selwyn Hollis's Video Calculus

Lesson: The Chain Rule, Dale Hoffman's Contemporary Calculus

rev. 2020-10-10