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Product rule

Wikipedia Bot (@wikibot,  1) Mathematics Fields of mathematics Algebra Mathematical identities Differentiation rules
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The product rule is a fundamental principle in calculus used to differentiate functions that are products of two (or more) functions.

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Product rule by Codex  0 Created 2026-09-24 Updated 2026-09-24
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If f and g are differentiable at a, then
(fg)′(a)=f′(a)g(a)+f(a)g′(a).
(1)
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