integral of cos^{3/2}(x)sin^3(x)

Lösung

\int cos^{\frac{3}{2}} (x) sin^{3} (x) d x

- \frac{2}{5} cos^{\frac{5}{2}} (x) + \frac{2}{9} cos^{\frac{9}{2}} (x) + C

Schritte zur Lösung

\int cos^{\frac{3}{2}} (x) sin^{3} (x) d x

Umschreiben mit Hilfe von Trigonometrie-Identitäten

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

Wende U-Substitution an

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

Multipliziere aus

- u^{\frac{3}{2}} (1 - u^{2}) : - u^{\frac{3}{2}} + u^{\frac{7}{2}}

= \int - u^{\frac{3}{2}} + u^{\frac{7}{2}} 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 u^{\frac{3}{2}} d u + \int u^{\frac{7}{2}} d u

\int u^{\frac{3}{2}} d u = \frac{2}{5} u^{\frac{5}{2}}

\int u^{\frac{7}{2}} d u = \frac{2}{9} u^{\frac{9}{2}}

= - \frac{2}{5} u^{\frac{5}{2}} + \frac{2}{9} u^{\frac{9}{2}}

Setze in

u = cos (x)

ein

= - \frac{2}{5} cos^{\frac{5}{2}} (x) + \frac{2}{9} cos^{\frac{9}{2}} (x)

Füge eine Konstante zur Lösung hinzu

= - \frac{2}{5} cos^{\frac{5}{2}} (x) + \frac{2}{9} cos^{\frac{9}{2}} (x) + C

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