derivative f(x)=(x+2)/(x-2)

解答

导数

f (x) = \frac{x + 2}{x - 2}

- \frac{4}{( x - 2 ) ^{2}}

求解步骤

\frac{d}{d x} (\frac{x + 2}{x - 2})

使用微分除法定则:

(\frac{f}{g})^{'} = \frac{f ^{'} \cdot g - g ^{'} \cdot f}{g ^{2}}

= \frac{\frac{d}{d x} ( x + 2 ) ( x - 2 ) - \frac{d}{d x} ( x - 2 ) ( x + 2 )}{( x - 2 ) ^{2}}

\frac{d}{d x} (x + 2) = 1

\frac{d}{d x} (x - 2) = 1

= \frac{1 \cdot ( x - 2 ) - 1 \cdot ( x + 2 )}{( x - 2 ) ^{2}}

化简

\frac{1 \cdot ( x - 2 ) - 1 \cdot ( x + 2 )}{( x - 2 ) ^{2}} : - \frac{4}{( x - 2 ) ^{2}}

= - \frac{4}{( x - 2 ) ^{2}}

\int ln ((3 x)^{2}) d x

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x \to 3 lim (5 x^{3} - 3 x + x - 6)