The Chain Rule — Cheat sheet

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Core rule

(f∘g)′(x)=f′(g(x))g′(x).(f\circ g)'(x)=f'(g(x))g'(x).

Differentiate the outer layer while retaining its input, then multiply by the inner derivative. Repeat for additional layers.

Watch for

Distinguish a product from a composition. Check domains before applying logarithmic or root formulas.