integral of (30)/((x-1)(x^2+9))

Lösung

\int \frac{30}{( x - 1 ) ( x ^{2} + 9 )} d x

30 (\frac{1}{10} ln ∣ x - 1 ∣ + \frac{1}{10} (- \frac{1}{2} ln x^{2} + 9 - \frac{1}{3} arctan (\frac{x}{3}))) + C

Schritte zur Lösung

\int \frac{30}{( x - 1 ) ( x ^{2} + 9 )} d x

Entferne die Konstante:

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

= 30 \cdot \int \frac{1}{( x - 1 ) ( x ^{2} + 9 )} d x

Ermittle den Partialbruch von

\frac{1}{( x - 1 ) ( x ^{2} + 9 )} : \frac{1}{10 ( x - 1 )} + \frac{- x - 1}{10 ( x ^{2} + 9 )}

= 30 \cdot \int \frac{1}{10 ( x - 1 )} + \frac{- x - 1}{10 ( x ^{2} + 9 )} 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

= 30 (\int \frac{1}{10 ( x - 1 )} d x + \int \frac{- x - 1}{10 ( x ^{2} + 9 )} d x)

\int \frac{1}{10 ( x - 1 )} d x = \frac{1}{10} ln ∣ x - 1 ∣

\int \frac{- x - 1}{10 ( x ^{2} + 9 )} d x = \frac{1}{10} (- \frac{1}{2} ln x^{2} + 9 - \frac{1}{3} arctan (\frac{x}{3}))

= 30 (\frac{1}{10} ln ∣ x - 1 ∣ + \frac{1}{10} (- \frac{1}{2} ln x^{2} + 9 - \frac{1}{3} arctan (\frac{x}{3})))

Füge eine Konstante zur Lösung hinzu

= 30 (\frac{1}{10} ln ∣ x - 1 ∣ + \frac{1}{10} (- \frac{1}{2} ln x^{2} + 9 - \frac{1}{3} arctan (\frac{x}{3}))) + C

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