When do I use dy/dx = dy/du · du/dx in Differentiation, and what does it mean?
the chain rule for composite functions.
dy/dx = dy/du · du/dx — the chain rule for composite functions. Use it when: y is a function of u, u of x. Always check the condition holds before plugging in numbers.
Key point
dy/dx = dy/du · du/dx
Tap to watch or see it right here — the app stays open (it only opens a quick search if nothing embeddable is found).