integral of 1/(x(x^{10)+1)}

Lösung

\int \frac{1}{x ( x ^{10} + 1 )} d x

\frac{1}{10} (10 ln (x) - ln 1 + x^{10}) + C

Schritte zur Lösung

\int \frac{1}{x ( x ^{10} + 1 )} d x

Wende U-Substitution an

= \int \frac{1}{10 ( u - 1 ) u} d u

Entferne die Konstante:

\int a \cdot f (x) d x = a \cdot \int f (x) d x

= \frac{1}{10} \cdot \int \frac{1}{( u - 1 ) u} d u

Ermittle den Partialbruch von

\frac{1}{( u - 1 ) u} : \frac{1}{u - 1} - \frac{1}{u}

= \frac{1}{10} \cdot \int \frac{1}{u - 1} - \frac{1}{u} d u

Wende die Summenregel an:

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

= \frac{1}{10} (\int \frac{1}{u - 1} d u - \int \frac{1}{u} d u)

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

\int \frac{1}{u} d u = ln ∣ u ∣

= \frac{1}{10} (ln ∣ u - 1 ∣ - ln ∣ u ∣)

Setze in

u = 1 + x^{10}

ein

= \frac{1}{10} (ln 1 + x^{10} - 1 - ln 1 + x^{10})

Vereinfache

\frac{1}{10} (ln 1 + x^{10} - 1 - ln 1 + x^{10}) : \frac{1}{10} (10 ln (x) - ln 1 + x^{10})

= \frac{1}{10} (10 ln (x) - ln 1 + x^{10})

Füge eine Konstante zur Lösung hinzu

= \frac{1}{10} (10 ln (x) - ln 1 + x^{10}) + C

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