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

Lösung

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

- \frac{2}{3} ln ∣ x - 1 ∣ + \frac{1}{3} ln x^{2} + x + 1 + C

Schritte zur Lösung

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

Ermittle den Partialbruch von

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

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

\int \frac{2}{3 ( x - 1 )} d x = \frac{2}{3} ln ∣ x - 1 ∣

\int \frac{2 x + 1}{3 ( x ^{2} + x + 1 )} d x = \frac{1}{3} ln x^{2} + x + 1

= - \frac{2}{3} ln ∣ x - 1 ∣ + \frac{1}{3} ln x^{2} + x + 1

Füge eine Konstante zur Lösung hinzu

= - \frac{2}{3} ln ∣ x - 1 ∣ + \frac{1}{3} ln x^{2} + x + 1 + C

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