product rule

== English == === Pronunciation === === Proper noun === product rule (mathematics) A formula used to find the derivatives of products of two or more functions: ( f ⋅ g ) ′ = f ′ ⋅ g + f ⋅ g ′ {\displaystyle (f\cdot g)'=f'\cdot g+f\cdot g'\,\!} ==== Translations ====