The product rule is a rule of differentiation which states that for a differentiable function : In prime notation: In the case of three terms multiplied together, the rule becomes One of the most common differentiation rules used for functions of combination, it is also very simple to apply. For instance, consider the function . The derivative is easily found: File:Integral apl obsah2.svg This calculus-related article contains minimal information concerning its topic. You can help the Mathematics Wikia by adding to it.