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In calculus, the quotient rule is a method of finding the derivative of a function that is the quotient of two other functions for which derivatives exist. If the function one wishes to differentiate, , can be written as : and , then the rule states that the derivative of is : More precisely, if all ''x'' in some open set containing the number ''a'' satisfy , and and both exist, then exists as well and : And this can be extended to calculate the second derivative as well (one can prove this by taking the derivative of twice). The result of this is: : The quotient rule formula can be derived from the product rule and chain rule. == Examples == The derivative of is: : ■ウィキペディアで「Quotient rule」の詳細全文を読む スポンサード リンク
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