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Quotient rule : ウィキペディア英語版
Quotient rule

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, f(x), can be written as
:f(x) = \frac
and h(x)\not=0, then the rule states that the derivative of g(x)/h(x) is
:f'(x) = \frac.
More precisely, if all ''x'' in some open set containing the number ''a'' satisfy h(a)\not=0, and g'(a) and h'(a) both exist, then f'(a) exists as well and
:f'(a)=\frac.
And this can be extended to calculate the second derivative as well (one can prove this by taking the derivative of f(x)=g(x)(h(x))^ twice). The result of this is:
:f''(x)=\frac.
The quotient rule formula can be derived from the product rule and chain rule.
== Examples ==
The derivative of (4x - 2)/(x^2 + 1) is:
:\begin\frac\left(ウィキペディア(Wikipedia)

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