derivative y= 1/((x^2-2)(x^2+x+5))

解

導関数

y = \frac{1}{( x ^{2} - 2 ) ( x ^{2} + x + 5 )}

- \frac{4 x ^{3} + 3 x ^{2} + 6 x - 2}{( x ^{2} - 2 ) ^{2} ( x ^{2} + x + 5 ) ^{2}}

解答ステップ

\frac{d}{d x} (\frac{1}{( x ^{2} - 2 ) ( x ^{2} + x + 5 )})

指数の規則を適用する:

\frac{1}{a} = a^{- 1}

= \frac{d}{d x} (((x^{2} - 2) (x^{2} + x + 5))^{- 1})

連鎖法則を適用:

- \frac{1}{( ( x ^{2} - 2 ) ( x ^{2} + x + 5 ) ) ^{2}} \frac{d}{d x} ((x^{2} - 2) (x^{2} + x + 5))

= - \frac{1}{( ( x ^{2} - 2 ) ( x ^{2} + x + 5 ) ) ^{2}} \frac{d}{d x} ((x^{2} - 2) (x^{2} + x + 5))

\frac{d}{d x} ((x^{2} - 2) (x^{2} + x + 5)) = 4 x^{3} + 3 x^{2} + 6 x - 2

= - \frac{1}{( ( x ^{2} - 2 ) ( x ^{2} + x + 5 ) ) ^{2}} (4 x^{3} + 3 x^{2} + 6 x - 2)

簡素化

- \frac{1}{( ( x ^{2} - 2 ) ( x ^{2} + x + 5 ) ) ^{2}} (4 x^{3} + 3 x^{2} + 6 x - 2) : - \frac{4 x ^{3} + 3 x ^{2} + 6 x - 2}{( x ^{2} - 2 ) ^{2} ( x ^{2} + x + 5 ) ^{2}}

= - \frac{4 x ^{3} + 3 x ^{2} + 6 x - 2}{( x ^{2} - 2 ) ^{2} ( x ^{2} + x + 5 ) ^{2}}