Product rule
Formula for the derivative of a product
Product rule
In calculus, the product rule (or Leibniz rule or Leibniz product rule) is a formula used to find the derivatives of products of two or more functions. For two functions, it may be stated in Lagrange's notation as (u⋅v)′=u′⋅v+u⋅v′ or in Leibniz's notation as ddx(u⋅v)=dudx⋅v+u⋅dvdx. The rule may be extended or generalized to products of three or more functions, to a rule for higher-order derivatives of a product, and to other contexts.
Read on Wikipedia · Image ThibautLienart, CC BY-SA 3.0
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