derivative of (2x^2-1/((x-1)^2))

解

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

\frac{2 ( - 2 x + 1 )}{( x - 1 ) ^{3}}

解答ステップ

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

商の法則を適用:

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

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

\frac{d}{d x} (2 x^{2} - 1) = 4 x

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

= \frac{4 x ( x - 1 ) ^{2} - 2 ( x - 1 ) ( 2 x ^{2} - 1 )}{( ( x - 1 ) ^{2} ) ^{2}}

簡素化

\frac{4 x ( x - 1 ) ^{2} - 2 ( x - 1 ) ( 2 x ^{2} - 1 )}{( ( x - 1 ) ^{2} ) ^{2}} : \frac{2 ( - 2 x + 1 )}{( x - 1 ) ^{3}}

= \frac{2 ( - 2 x + 1 )}{( x - 1 ) ^{3}}