The product rule says that the derivative of the product f(x)g(x) is f'(x)g(x)+f(x)g'(x). This helps us find the derivative of a function which is a product of two other, more basic, functions.
5560_Differentiating_products_of_more_than_two_functions.html
5559_Product_rule_example_mixed_implicit_explicit.html
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