integral from 0 to 1/2 of sqrt(1+4x^2)

Lösung

\int_{0}^{\frac{1}{2}} 1 + 4 x^{2} d x

\frac{2 + ln ( 1 + 2 )}{4}

Dezimale

0.57389 \dots

Schritte zur Lösung

\int_{0}^{\frac{1}{2}} 1 + 4 x^{2} d x

Trigonometrische Substitution anwenden

= \int_{0}^{\frac{π}{4}} \frac{1}{2} sec^{3} (u) d u

Entferne die Konstante:

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

= \frac{1}{2} \cdot \int_{0}^{\frac{π}{4}} sec^{3} (u) d u

Wende integrale Reduktion an

= \frac{1}{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)

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

Vereinfache

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

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

Berechne die Grenzen:

\frac{1}{2}

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

Vereinfache

= \frac{2 + ln ( 1 + 2 )}{4}

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