integral of x^3cos(1+x^2)

Lösung

\int x^{3} cos (1 + x^{2}) d x

\frac{1}{2} (x^{2} sin (1 + x^{2}) + cos (1 + x^{2})) + C

Schritte zur Lösung

\int x^{3} cos (1 + x^{2}) d x

Wende U-Substitution an

= \int \frac{( u - 1 ) cos ( u )}{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 (u - 1) cos (u) d u

Wende die partielle Integration an

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

\int sin (u) d u = - cos (u)

= \frac{1}{2} (sin (u) (u - 1) - (- cos (u)))

Setze in

u = 1 + x^{2}

ein

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

Vereinfache

\frac{1}{2} (sin (1 + x^{2}) (1 + x^{2} - 1) - (- cos (1 + x^{2}))) : \frac{1}{2} (x^{2} sin (1 + x^{2}) + cos (1 + x^{2}))

= \frac{1}{2} (x^{2} sin (1 + x^{2}) + cos (1 + x^{2}))

Füge eine Konstante zur Lösung hinzu

= \frac{1}{2} (x^{2} sin (1 + x^{2}) + cos (1 + x^{2})) + C

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