integral of 1/((x+5)^2(x-3))

解

\int \frac{1}{( x + 5 ) ^{2} ( x - 3 )} d x

- \frac{1}{64} ln ∣ x + 5 ∣ + \frac{1}{8 ( x + 5 )} + \frac{1}{64} ln ∣ x - 3 ∣ + C

解答ステップ

\int \frac{1}{( x + 5 ) ^{2} ( x - 3 )} d x

以下の部分分数を得る:

\frac{1}{( x + 5 ) ^{2} ( x - 3 )} : - \frac{1}{64 ( x + 5 )} - \frac{1}{8 ( x + 5 ) ^{2}} + \frac{1}{64 ( x - 3 )}

= \int - \frac{1}{64 ( x + 5 )} - \frac{1}{8 ( x + 5 ) ^{2}} + \frac{1}{64 ( x - 3 )} d x

総和規則を適用する:

\int f (x) \pm g (x) d x = \int f (x) d x \pm \int g (x) d x

= - \int \frac{1}{64 ( x + 5 )} d x - \int \frac{1}{8 ( x + 5 ) ^{2}} d x + \int \frac{1}{64 ( x - 3 )} d x

\int \frac{1}{64 ( x + 5 )} d x = \frac{1}{64} ln ∣ x + 5 ∣

\int \frac{1}{8 ( x + 5 ) ^{2}} d x = - \frac{1}{8 ( x + 5 )}

\int \frac{1}{64 ( x - 3 )} d x = \frac{1}{64} ln ∣ x - 3 ∣

= - \frac{1}{64} ln ∣ x + 5 ∣ - (- \frac{1}{8 ( x + 5 )}) + \frac{1}{64} ln ∣ x - 3 ∣

簡素化

= - \frac{1}{64} ln ∣ x + 5 ∣ + \frac{1}{8 ( x + 5 )} + \frac{1}{64} ln ∣ x - 3 ∣

定数を解答に追加する

= - \frac{1}{64} ln ∣ x + 5 ∣ + \frac{1}{8 ( x + 5 )} + \frac{1}{64} ln ∣ x - 3 ∣ + C