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Beliebt Rechnen >

integral of 6/(x(x^2+2)^2)

Lösung

\int \frac{6}{x ( x ^{2} + 2 ) ^{2}} d x

Lösung

3 (\frac{1}{2} ln (x) - \frac{1}{4} ln x^{2} + 2 + \frac{1}{2 ( x ^{2} + 2 )}) + C

Schritte zur Lösung

\int \frac{6}{x ( x ^{2} + 2 ) ^{2}} d x

Entferne die Konstante:

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

= 6 \cdot \int \frac{1}{x ( x ^{2} + 2 ) ^{2}} d x

Wende U-Substitution an

= 6 \cdot \int \frac{1}{2 u ( u + 2 ) ^{2}} d u

Entferne die Konstante:

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

= 6 \cdot \frac{1}{2} \cdot \int \frac{1}{u ( u + 2 ) ^{2}} d u

Ermittle den Partialbruch von

\frac{1}{u ( u + 2 ) ^{2}} : \frac{1}{4 u} - \frac{1}{4 ( u + 2 )} - \frac{1}{2 ( u + 2 ) ^{2}}

= 6 \cdot \frac{1}{2} \cdot \int \frac{1}{4 u} - \frac{1}{4 ( u + 2 )} - \frac{1}{2 ( u + 2 ) ^{2}} 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

= 6 \cdot \frac{1}{2} (\int \frac{1}{4 u} d u - \int \frac{1}{4 ( u + 2 )} d u - \int \frac{1}{2 ( u + 2 ) ^{2}} d u)

\int \frac{1}{4 u} d u = \frac{1}{4} ln ∣ u ∣

\int \frac{1}{4 ( u + 2 )} d u = \frac{1}{4} ln ∣ u + 2 ∣

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

= 6 \cdot \frac{1}{2} (\frac{1}{4} ln ∣ u ∣ - \frac{1}{4} ln ∣ u + 2 ∣ - (- \frac{1}{2 ( u + 2 )}))

Setze in

u = x^{2}

ein

= 6 \cdot \frac{1}{2} (\frac{1}{4} ln x^{2} - \frac{1}{4} ln x^{2} + 2 - (- \frac{1}{2 ( x ^{2} + 2 )}))

Vereinfache

6 \cdot \frac{1}{2} (\frac{1}{4} ln x^{2} - \frac{1}{4} ln x^{2} + 2 - (- \frac{1}{2 ( x ^{2} + 2 )})) : 3 (\frac{1}{2} ln (x) - \frac{1}{4} ln x^{2} + 2 + \frac{1}{2 ( x ^{2} + 2 )})

= 3 (\frac{1}{2} ln (x) - \frac{1}{4} ln x^{2} + 2 + \frac{1}{2 ( x ^{2} + 2 )})

Füge eine Konstante zur Lösung hinzu

= 3 (\frac{1}{2} ln (x) - \frac{1}{4} ln x^{2} + 2 + \frac{1}{2 ( x ^{2} + 2 )}) + C

Graph

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