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

Lösung

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

- \frac{1}{2} ln 4 x^{2} + 4 x + 8 - \frac{3}{7} arctan (\frac{1}{7} (2 x + 1)) + \frac{1}{2} ln x^{2} + 2 + \frac{1}{2} arctan (\frac{x}{2}) + C

Schritte zur Lösung

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

Ermittle den Partialbruch von

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

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

\int \frac{- x - 2}{x ^{2} + x + 2} d x = - \frac{1}{2} ln 4 x^{2} + 4 x + 8 - \frac{3}{7} arctan (\frac{1}{7} (2 x + 1))

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

= - \frac{1}{2} ln 4 x^{2} + 4 x + 8 - \frac{3}{7} arctan (\frac{1}{7} (2 x + 1)) + \frac{1}{2} ln x^{2} + 2 + \frac{1}{2} arctan (\frac{x}{2})

Füge eine Konstante zur Lösung hinzu

= - \frac{1}{2} ln 4 x^{2} + 4 x + 8 - \frac{3}{7} arctan (\frac{1}{7} (2 x + 1)) + \frac{1}{2} ln x^{2} + 2 + \frac{1}{2} arctan (\frac{x}{2}) + C

\frac{d}{d x} (x ln (x) - x + 1)

\int \frac{( 1 + 15 x )}{x} d x

\int \frac{x + 5}{x + 1} d x

in v erse l a pl a ce - \frac{1}{s ( s ^{2} + 1 )}

y^{^{''}} + 4 y = 8 sin (2 x)