integral of ((x^5))/(sqrt(x^2+2))

Lösung

\int \frac{( x ^{5} )}{x ^{2} + 2} d x

42 \frac{1}{2} (2 + x^{2}) - \frac{4}{3} (2 + x^{2})^{\frac{3}{2}} + \frac{1}{5} (2 + x^{2})^{\frac{5}{2}} + C

Schritte zur Lösung

\int \frac{x ^{5}}{x ^{2} + 2} d x

Trigonometrische Substitution anwenden

= \int 42 tan^{5} (u) sec (u) d u

Entferne die Konstante:

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

= 42 \cdot \int tan^{5} (u) sec (u) d u

Umschreiben mit Hilfe von Trigonometrie-Identitäten

= 42 \cdot \int (- 1 + sec^{2} (u))^{2} tan (u) sec (u) d u

Wende U-Substitution an

= 42 \cdot \int (- 1 + v^{2})^{2} d v

Multipliziere aus

(- 1 + v^{2})^{2} : 1 - 2 v^{2} + v^{4}

= 42 \cdot \int 1 - 2 v^{2} + v^{4} d v

Wende die Summenregel an:

\int f (x) \pm g (x) d x = \int f (x) d x \pm \int g (x) d x

= 42 (\int 1 d v - \int 2 v^{2} d v + \int v^{4} d v)

\int 1 d v = v

\int 2 v^{2} d v = \frac{2 v ^{3}}{3}

\int v^{4} d v = \frac{v ^{5}}{5}

= 42 (v - \frac{2 v ^{3}}{3} + \frac{v ^{5}}{5})

Ersetze zurück

= 42 sec (arctan (\frac{1}{2} x)) - \frac{2 sec ^{3} ( arctan ( \frac{1}{2} x ) )}{3} + \frac{sec ^{5} ( arctan ( \frac{1}{2} x ) )}{5}

Vereinfache

42 sec (arctan (\frac{1}{2} x)) - \frac{2 sec ^{3} ( arctan ( \frac{1}{2} x ) )}{3} + \frac{sec ^{5} ( arctan ( \frac{1}{2} x ) )}{5} : 42 \frac{1}{2} (2 + x^{2}) - \frac{4}{3} (2 + x^{2})^{\frac{3}{2}} + \frac{1}{5} (2 + x^{2})^{\frac{5}{2}}

= 42 \frac{1}{2} (2 + x^{2}) - \frac{4}{3} (2 + x^{2})^{\frac{3}{2}} + \frac{1}{5} (2 + x^{2})^{\frac{5}{2}}

Füge eine Konstante zur Lösung hinzu

= 42 \frac{1}{2} (2 + x^{2}) - \frac{4}{3} (2 + x^{2})^{\frac{3}{2}} + \frac{1}{5} (2 + x^{2})^{\frac{5}{2}} + C

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