integral of 1/(x^3(x-1))

Lösung

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

- ln ∣ x ∣ + \frac{1}{x} + \frac{1}{2 x ^{2}} + ln ∣ x - 1 ∣ + C

Schritte zur Lösung

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

Ermittle den Partialbruch von

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

= \int - \frac{1}{x} - \frac{1}{x ^{2}} - \frac{1}{x ^{3}} + \frac{1}{x - 1} d x

Wende die Summenregel an:

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

= - \int \frac{1}{x} d x - \int \frac{1}{x ^{2}} d x - \int \frac{1}{x ^{3}} d x + \int \frac{1}{x - 1} d x

\int \frac{1}{x} d x = ln ∣ x ∣

\int \frac{1}{x ^{2}} d x = - \frac{1}{x}

\int \frac{1}{x ^{3}} d x = - \frac{1}{2 x ^{2}}

\int \frac{1}{x - 1} d x = ln ∣ x - 1 ∣

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

Vereinfache

= - ln ∣ x ∣ + \frac{1}{x} + \frac{1}{2 x ^{2}} + ln ∣ x - 1 ∣

Füge eine Konstante zur Lösung hinzu

= - ln ∣ x ∣ + \frac{1}{x} + \frac{1}{2 x ^{2}} + ln ∣ x - 1 ∣ + C

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