3.5 The Chain Rule Greg Kelly, Hanford High School, Richland, Washington Photo by Vickie Kelly, 2002.

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Presentation transcript:

3.5 The Chain Rule Greg Kelly, Hanford High School, Richland, Washington Photo by Vickie Kelly, 2002

We now have a pretty good list of “shortcuts” to find derivatives of simple functions. Of course, many of the functions that we will encounter are not so simple. What is needed is a way to combine derivative rules to evaluate more complicated functions.

Consider a simple composite function:

and another: This pattern is called the chain rule.

The Chain Rule:

Example: Find dy/dx at x = 2

Here is a faster way to find the derivative: Differentiate the outside function... …then the inside function

Another example: It looks like we need to use the chain rule again! derivative of the outside function derivative of the inside function

Another example: The chain rule can be used more than once. (That’s what makes the “chain” in the “chain rule”!)

Derivative formulas include the chain rule! etcetera…

Don’t forget to use the chain rule! p

Your Turn! Use the Chain Rule to find the following: