The Product Rule (College Board AP® Calculus AB): Study Guide
Derivatives of products
How do I differentiate the product of two functions?
The derivative of the product of two functions can be found by using the product rule
The product rule states that
If
,
then
This is also commonly written as
If
,
then
Or in a more concise form:
Examiner Tips and Tricks
Don't confuse the product of two functions with a composite function
The product of two functions like
is two functions multiplied together
A composite function like
is a function of a function
For how to differentiate composite functions, see the "Chain rule" study guide
Worked Example
Find the derivative of the following functions.
(a)
Answer:
Assign and
to each function
Find the derivatives of and
Apply the product rule,
If you have used a different notation such as when working, you should write your final answer in a format that matches how the question was asked
This answer can also be factorized
(b)
Answer:
Assign and
to each function
Find the derivatives of and
Apply the product rule,
Simplify
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