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Beliebt Rechnen >

integral of (3x^2-1)/((x^3-x)^2)

Lösung

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

Lösung

\frac{1}{x} - \frac{1}{2 ( x + 1 )} - \frac{1}{2 ( x - 1 )} + C

Schritte zur Lösung

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

Ermittle den Partialbruch von

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

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

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

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

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

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

Vereinfache

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

Füge eine Konstante zur Lösung hinzu

= \frac{1}{x} - \frac{1}{2 ( x + 1 )} - \frac{1}{2 ( x - 1 )} + C

Graph

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