integral of 1/((x+8)(x^2+16))

Lösung

\int \frac{1}{( x + 8 ) ( x ^{2} + 16 )} d x

\frac{1}{80} ln ∣ x + 8 ∣ + \frac{1}{80} (- \frac{1}{2} ln \frac{x ^{2}}{16} + 1 + 2 arctan (\frac{x}{4})) + C

Schritte zur Lösung

\int \frac{1}{( x + 8 ) ( x ^{2} + 16 )} d x

Ermittle den Partialbruch von

\frac{1}{( x + 8 ) ( x ^{2} + 16 )} : \frac{1}{80 ( x + 8 )} + \frac{- x + 8}{80 ( x ^{2} + 16 )}

= \int \frac{1}{80 ( x + 8 )} + \frac{- x + 8}{80 ( x ^{2} + 16 )} 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}{80 ( x + 8 )} d x + \int \frac{- x + 8}{80 ( x ^{2} + 16 )} d x

\int \frac{1}{80 ( x + 8 )} d x = \frac{1}{80} ln ∣ x + 8 ∣

\int \frac{- x + 8}{80 ( x ^{2} + 16 )} d x = \frac{1}{80} (- \frac{1}{2} ln \frac{x ^{2}}{16} + 1 + 2 arctan (\frac{x}{4}))

= \frac{1}{80} ln ∣ x + 8 ∣ + \frac{1}{80} (- \frac{1}{2} ln \frac{x ^{2}}{16} + 1 + 2 arctan (\frac{x}{4}))

Füge eine Konstante zur Lösung hinzu

= \frac{1}{80} ln ∣ x + 8 ∣ + \frac{1}{80} (- \frac{1}{2} ln \frac{x ^{2}}{16} + 1 + 2 arctan (\frac{x}{4})) + C

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