# CALCULUS: FINDING A DERIVATIVE BY USING THE PRODUCT RULE

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The product rule is a process of differentiation for a product of two functions. This rule is for differentiating functions where one function is multiplied by another. The rule follows from the limit definition of derivative and is given by:

dy/dx = f ' (x) . g(x) + f(x) . g ' (x)

In this document, the rule is given formally and several examples are worked out.
The document should serve as a useful guide for introductory examples for derivatives.
Knowledge about power rule and derivatives of some trigonometric functions is assumed.
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4 pages
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2 days
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