What is the product rule?
- The product rule is a formula that allows you to differentiate a product of two functions
- The product rule formulae are in the formulae booklet – make sure you know how to find them.
- Don't confuse the product of two functions with a composite function:
- The product of two functions is two functions multiplied together
- A composite function is a function of a function
- To differentiate composite functions you need to use the chain rule