Edexcel A Level Maths: Pure:復習筆記7.3.4 Product Rule
Product Rule
What is the product rule?
- The product rule is a formula that allows you to differentiate a?product of two functions
- If
?where?u?and?v?are functions of?x?then the product rule is:
- In?function notation,?if
?then the product rule can be written as:
- The easiest way to remember the product rule is, for ?where?u?and?v?are functions of?x:
Exam Tip
- The product rule formulae are NOT in the? formulae booklet – you need to know 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
Worked Example
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