integral of 3/(xsqrt(9-x^2))

Lösung

\int \frac{3}{x 9 - x ^{2}} d x

- \frac{1}{2} ln \frac{9 - x ^{2}}{3} + 1 + \frac{1}{2} ln \frac{9 - x ^{2}}{3} - 1 + C

Schritte zur Lösung

\int \frac{3}{x 9 - x ^{2}} d x

Entferne die Konstante:

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

= 3 \cdot \int \frac{1}{x 9 - x ^{2}} d x

Wende U-Substitution an

= 3 \cdot \int - \frac{1}{- u ^{2} + 9} d u

Entferne die Konstante:

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

= 3 (- \int \frac{1}{- u ^{2} + 9} d u)

Wende integrale Substitution an

= 3 (- \int \frac{1}{3 ( - v ^{2} + 1 )} d v)

Entferne die Konstante:

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

= 3 (- \frac{1}{3} \cdot \int \frac{1}{- v ^{2} + 1} d v)

Nutze das gemeinsame Integral :

\int \frac{1}{- v ^{2} + 1} d v = \frac{ln ∣ v + 1 ∣}{2} - \frac{ln ∣ v - 1 ∣}{2}

= 3 (- \frac{1}{3} (\frac{ln ∣ v + 1 ∣}{2} - \frac{ln ∣ v - 1 ∣}{2}))

Ersetze zurück

= 3 - \frac{1}{3} \frac{ln \frac{9 - x ^{2}}{3} + 1}{2} - \frac{ln \frac{9 - x ^{2}}{3} - 1}{2}

Vereinfache

3 - \frac{1}{3} \frac{ln \frac{9 - x ^{2}}{3} + 1}{2} - \frac{ln \frac{9 - x ^{2}}{3} - 1}{2} : - \frac{1}{2} ln \frac{9 - x ^{2}}{3} + 1 + \frac{1}{2} ln \frac{9 - x ^{2}}{3} - 1

= - \frac{1}{2} ln \frac{9 - x ^{2}}{3} + 1 + \frac{1}{2} ln \frac{9 - x ^{2}}{3} - 1

Füge eine Konstante zur Lösung hinzu

= - \frac{1}{2} ln \frac{9 - x ^{2}}{3} + 1 + \frac{1}{2} ln \frac{9 - x ^{2}}{3} - 1 + C

\int (3 x + 4) e^{x} d x

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