integral of sin^2(pix)cos^5(pix)

Lösung

\int sin^{2} (π x) cos^{5} (π x) d x

\frac{1}{π} (\frac{sin ^{3} ( π x )}{3} - \frac{2 sin ^{5} ( π x )}{5} + \frac{sin ^{7} ( π x )}{7}) + C

Schritte zur Lösung

\int sin^{2} (π x) cos^{5} (π x) d x

Wende U-Substitution an

= \int sin^{2} (u) cos^{5} (u) \frac{1}{π} d u

Entferne die Konstante:

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

= \frac{1}{π} \cdot \int sin^{2} (u) cos^{5} (u) d u

Umschreiben mit Hilfe von Trigonometrie-Identitäten

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

Wende U-Substitution an

= \frac{1}{π} \cdot \int v^{2} (1 - v^{2})^{2} d v

Multipliziere aus

v^{2} (1 - v^{2})^{2} : v^{2} - 2 v^{4} + v^{6}

= \frac{1}{π} \cdot \int v^{2} - 2 v^{4} + v^{6} d v

Wende die Summenregel an:

\int f (x) \pm g (x) d x = \int f (x) d x \pm \int g (x) d x

= \frac{1}{π} (\int v^{2} d v - \int 2 v^{4} d v + \int v^{6} d v)

\int v^{2} d v = \frac{v ^{3}}{3}

\int 2 v^{4} d v = \frac{2 v ^{5}}{5}

\int v^{6} d v = \frac{v ^{7}}{7}

= \frac{1}{π} (\frac{v ^{3}}{3} - \frac{2 v ^{5}}{5} + \frac{v ^{7}}{7})

Ersetze zurück

= \frac{1}{π} (\frac{sin ^{3} ( π x )}{3} - \frac{2 sin ^{5} ( π x )}{5} + \frac{sin ^{7} ( π x )}{7})

Füge eine Konstante zur Lösung hinzu

= \frac{1}{π} (\frac{sin ^{3} ( π x )}{3} - \frac{2 sin ^{5} ( π x )}{5} + \frac{sin ^{7} ( π x )}{7}) + C

d er i v a t i v e 3 6 + 2 x + x^{3}

\frac{d}{d x} (csc^{2} (1 - 2 x))

x \to - 1 lim (3 x^{4} - 6 x + 1)

\int 3 x^{2} + 2 x d x

x \to 2 lim (x^{3} - 5 x)