product rule

product rule, Rule for finding the derivative of a product of two functions. If both f and g are differentiable, then (fg)′ = fg′ + f′g.

This article was most recently revised and updated by William L. Hosch.
Citation Information
Article Title: product rule
Website Name: Encyclopaedia Britannica
Publisher: Encyclopaedia Britannica, Inc.
Date Published: 04 October 2024
URL: https://www.britannica.comhttps://www.britannica.com/science/product-rule
Access Date: November 21, 2024