integral from pi/6 to pi/4 of cos(2x)

Lösung

\int_{\frac{π}{6}}^{\frac{π}{4}} cos (2 x) d x

\frac{2 - 3}{4}

Dezimale

0.06698 \dots

Schritte zur Lösung

\int_{\frac{π}{6}}^{\frac{π}{4}} cos (2 x) d x

Wende U-Substitution an

= \int_{\frac{π}{3}}^{\frac{π}{2}} cos (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_{\frac{π}{3}}^{\frac{π}{2}} cos (u) d u

Nutze das gemeinsame Integral :

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

= \frac{1}{2} [sin (u)]_{\frac{π}{3}}^{\frac{π}{2}}

Berechne die Grenzen:

1 - \frac{3}{2}

= \frac{1}{2} (1 - \frac{3}{2})

Vereinfache

= \frac{2 - 3}{4}

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