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Beliebt Rechnen >

integral of (cos(x))/(sin^3(x)+sin(x))

Lösung

\int \frac{cos ( x )}{sin ^{3} ( x ) + sin ( x )} d x

Lösung

ln ∣ sin (x) ∣ - \frac{1}{2} ln sin^{2} (x) + 1 + C

Schritte zur Lösung

\int \frac{cos ( x )}{sin ^{3} ( x ) + sin ( x )} d x

Wende U-Substitution an

= \int \frac{1}{u ^{3} + u} d u

Ermittle den Partialbruch von

\frac{1}{u ^{3} + u} : \frac{1}{u} - \frac{u}{u ^{2} + 1}

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

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}{u} d u - \int \frac{u}{u ^{2} + 1} d u

\int \frac{1}{u} d u = ln ∣ u ∣

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

= ln ∣ u ∣ - \frac{1}{2} ln u^{2} + 1

Setze in

u = sin (x)

ein

= ln ∣ sin (x) ∣ - \frac{1}{2} ln sin^{2} (x) + 1

Füge eine Konstante zur Lösung hinzu

= ln ∣ sin (x) ∣ - \frac{1}{2} ln sin^{2} (x) + 1 + C

Graph

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