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Beliebt Rechnen >

integral of cot^5(3x)

Lösung

\int cot^{5} (3 x) d x

Lösung

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

Schritte zur Lösung

\int cot^{5} (3 x) d x

Wende U-Substitution an

= \int cot^{5} (u) \frac{1}{3} d u

Entferne die Konstante:

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

= \frac{1}{3} \cdot \int cot^{5} (u) d u

Wende U-Substitution an

= \frac{1}{3} \cdot \int - \frac{v ^{5}}{1 + v ^{2}} d v

Entferne die Konstante:

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

= \frac{1}{3} (- \int \frac{v ^{5}}{1 + v ^{2}} d v)

Lange Division

\frac{v ^{5}}{1 + v ^{2}} : v^{3} - v + \frac{v}{v ^{2} + 1}

= \frac{1}{3} (- \int v^{3} - v + \frac{v}{v ^{2} + 1} 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

= \frac{1}{3} (- (\int v^{3} d v - \int v d v + \int \frac{v}{v ^{2} + 1} d v))

\int v^{3} d v = \frac{v ^{4}}{4}

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

\int \frac{v}{v ^{2} + 1} d v = \frac{1}{2} ln v^{2} + 1

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

Ersetze zurück

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

Vereinfache

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

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

Füge eine Konstante zur Lösung hinzu

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

Graph

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