Connected Rates of Change (Cambridge International A-Level Mathematics)

Connected Rates of Change

What are connected rates of change?

• In situations involving more than two variables you can use the chain rule to connect multiple rates of change into a single equation

Exam Hint

• These problems can involve a lot of letters – be sure to keep track of what they all refer to.
• Be especially sure that you are clear about which letters are variables and which are constants – these behave very differently when differentiation is involved!

Worked Example