integral from 0 to 1 of 2sqrt(x^2+1)

Lösung

\int_{0}^{1} 2 x^{2} + 1 d x

2 + ln (1 + 2)

Dezimale

2.29558 \dots

Schritte zur Lösung

\int_{0}^{1} 2 x^{2} + 1 d x

Entferne die Konstante:

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

= 2 \cdot \int_{0}^{1} x^{2} + 1 d x

Trigonometrische Substitution anwenden

= 2 \cdot \int_{0}^{\frac{π}{4}} sec^{3} (u) d u

Wende integrale Reduktion an

= 2 ([\frac{sec ^{2} ( u ) sin ( u )}{2}]_{0}^{\frac{π}{4}} + \frac{1}{2} \cdot \int_{0}^{\frac{π}{4}} sec (u) d u)

\int_{0}^{\frac{π}{4}} sec (u) d u = ln (1 + 2)

= 2 ([\frac{sec ^{2} ( u ) sin ( u )}{2}]_{0}^{\frac{π}{4}} + \frac{1}{2} ln (1 + 2))

Vereinfache

2 ([\frac{sec ^{2} ( u ) sin ( u )}{2}]_{0}^{\frac{π}{4}} + \frac{1}{2} ln (1 + 2)) : 2 [\frac{1}{2} sec (u) tan (u)]_{0}^{\frac{π}{4}} + ln (1 + 2)

= 2 [\frac{1}{2} sec (u) tan (u)]_{0}^{\frac{π}{4}} + ln (1 + 2)

Berechne die Grenzen:

\frac{1}{2}

= 2 \cdot \frac{1}{2} + ln (1 + 2)

Vereinfache

= 2 + ln (1 + 2)

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