Regulate product

In Mathematical, the rule of the product of calculation, also called rule of Leibniz control surface the differentiation of the products of function S diifférentiables. One can state it as follows:

$(fg)\; “=gf\text{'}+fg”\; \backslash ,$

or with the notation of Leibniz as follows:

$\{D\; \backslash \; over\; dx\}\; (UV)\; =u\; \{FD\; \backslash \; over\; dx\}\; +v\; \{of\; the\; \backslash \; over\; dx\}.$

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