Product Rule

In calculus, the product rule is a formula used to find the derivatives of products of two or more functions. It may be stated thus:

or in the Leibniz notation thus:

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In the notation of differentials this can be written as follows:

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The derivative of the product of three functions is:

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Read more about Product Rule:  Discovery By Leibniz, Examples, A Common Error, Proof of The Product Rule, Applications

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