integral from 0 to 1 of sqrt(1+8x^2)

Lösung

\int_{0}^{1} 1 + 8 x^{2} d x

\frac{3}{2} + \frac{1}{4 2} ln (22 + 3)

Dezimale

1.81161 \dots

Schritte zur Lösung

\int_{0}^{1} 1 + 8 x^{2} d x

Trigonometrische Substitution anwenden

= \int_{0}^{a r c t a n (22)} \frac{1}{2 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 2} \cdot \int_{0}^{a r c t a n (22)} sec^{3} (u) d u

Wende integrale Reduktion an

= \frac{1}{2 2} [\frac{sec ^{2} ( u ) sin ( u )}{2}]_{0}^{a r c t a n (22)} + \frac{1}{2} \cdot \int_{0}^{a r c t a n (22)} sec (u) d u

\int_{0}^{a r c t a n (22)} sec (u) d u = ln (22 + 3)

= \frac{1}{2 2} [\frac{sec ^{2} ( u ) sin ( u )}{2}]_{0}^{a r c t a n (22)} + \frac{1}{2} ln (22 + 3)

Vereinfache

\frac{1}{2 2} [\frac{sec ^{2} ( u ) sin ( u )}{2}]_{0}^{a r c t a n (22)} + \frac{1}{2} ln (22 + 3) : \frac{1}{2 2} ([\frac{1}{2} sec (u) tan (u)]_{0}^{a r c t a n (22)} + \frac{1}{2} ln (22 + 3))

= \frac{1}{2 2} ([\frac{1}{2} sec (u) tan (u)]_{0}^{a r c t a n (22)} + \frac{1}{2} ln (22 + 3))

Berechne die Grenzen:

32

= \frac{1}{2 2} (32 + \frac{1}{2} ln (22 + 3))

Vereinfache

= \frac{3}{2} + \frac{1}{4 2} ln (22 + 3)

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