What rhymes with quotient rule?
quo·tien·t rule

In calculus, the quotient rule is a method of finding the derivative of a function that is the ratio of two differentiable functions. Let f ( x ) = g ( x ) / h ( x ) , {\displaystyle f(x)=g(x)/h(x),} where both g {\displaystyle g} and h {\displaystyle h} are differentiable and h ( x ) ≠ 0. {\displaystyle h(x)\neq 0.} The quotient rule states that the derivative of f ( x ) {\displaystyle f(x)} is f ′ ( x ) = g ′ ( x ) h ( x ) − g ( x ) h ′ ( x ) [ h ( x ) ] 2 . {\displaystyle f'(x)={\frac {g'(x)h(x)-g(x)h'(x)}{[h(x)]^{2}}}.}

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