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Beliebt Rechnen >

integral of (cos^2(2x))^2

Lösung

\int (cos^{2} (2 x))^{2} d x

Lösung

\frac{1}{2} (cos^{3} (2 x) sin (2 x) + \frac{3}{8} (2 x - \frac{1}{4} sin (8 x))) + C

Schritte zur Lösung

\int (cos^{2} (2 x))^{2} d x

Vereinfache

(cos^{2} (2 x))^{2} : cos^{4} (2 x)

= \int cos^{4} (2 x) d x

Wende U-Substitution an

= \int cos^{4} (u) \frac{1}{2} d u

Entferne die Konstante:

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

= \frac{1}{2} \cdot \int cos^{4} (u) d u

Vereinfache

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

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

Wende die partielle Integration an

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

Setze in

u = 2 x

ein

= \frac{1}{2} (cos^{3} (2 x) sin (2 x) - (- \frac{3}{8} (2 x - \frac{1}{4} sin (4 \cdot 2 x))))

Vereinfache

= \frac{1}{2} (cos^{3} (2 x) sin (2 x) + \frac{3}{8} (2 x - \frac{1}{4} sin (8 x)))

Füge eine Konstante zur Lösung hinzu

= \frac{1}{2} (cos^{3} (2 x) sin (2 x) + \frac{3}{8} (2 x - \frac{1}{4} sin (8 x))) + C

Graph

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