integral of sin^{-5}(x)cos^7(x)

Lösung

\int sin^{- 5} (x) cos^{7} (x) d x

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

Schritte zur Lösung

\int sin^{- 5} (x) cos^{7} (x) d x

Umschreiben mit Hilfe von Trigonometrie-Identitäten

= \int (1 - sin^{2} (x))^{3} cos (x) sin^{- 5} (x) d x

Wende U-Substitution an

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

Multipliziere aus

\frac{( 1 - u ^{2} ) ^{3}}{u ^{5}} : \frac{1}{u ^{5}} - \frac{3}{u ^{3}} + \frac{3}{u} - u

= \int \frac{1}{u ^{5}} - \frac{3}{u ^{3}} + \frac{3}{u} - u 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 ^{5}} d u - \int \frac{3}{u ^{3}} d u + \int \frac{3}{u} d u - \int u d u

\int \frac{1}{u ^{5}} d u = - \frac{1}{4 u ^{4}}

\int \frac{3}{u ^{3}} d u = - \frac{3}{2 u ^{2}}

\int \frac{3}{u} d u = 3 ln ∣ u ∣

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

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

Setze in

u = sin (x)

ein

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

Vereinfache

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

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

Füge eine Konstante zur Lösung hinzu

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

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