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Beliebt Rechnen >

integral of cos^4(6x)

Lösung

\int cos^{4} (6 x) d x

Lösung

\frac{1}{6} (cos^{3} (6 x) sin (6 x) + \frac{3}{8} (6 x - \frac{1}{4} sin (24 x))) + C

Schritte zur Lösung

\int cos^{4} (6 x) d x

Wende U-Substitution an

= \int cos^{4} (u) \frac{1}{6} d u

Entferne die Konstante:

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

= \frac{1}{6} \cdot \int cos^{4} (u) d u

Vereinfache

cos^{4} (u) : cos^{3} (u) cos (u)

= \frac{1}{6} \cdot \int cos^{3} (u) cos (u) d u

Wende die partielle Integration an

= \frac{1}{6} (cos^{3} (u) sin (u) - \int - 3 cos^{2} (u) sin^{2} (u) d u)

\int - 3 cos^{2} (u) sin^{2} (u) d u = - \frac{3}{8} (u - \frac{1}{4} sin (4 u))

= \frac{1}{6} (cos^{3} (u) sin (u) - (- \frac{3}{8} (u - \frac{1}{4} sin (4 u))))

Setze in

u = 6 x

ein

= \frac{1}{6} (cos^{3} (6 x) sin (6 x) - (- \frac{3}{8} (6 x - \frac{1}{4} sin (4 \cdot 6 x))))

Vereinfache

= \frac{1}{6} (cos^{3} (6 x) sin (6 x) + \frac{3}{8} (6 x - \frac{1}{4} sin (24 x)))

Füge eine Konstante zur Lösung hinzu

= \frac{1}{6} (cos^{3} (6 x) sin (6 x) + \frac{3}{8} (6 x - \frac{1}{4} sin (24 x))) + C

Graph

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