integral of (x^2)/((x^2+4)^{3/2)}

Lösung

\int \frac{x ^{2}}{( x ^{2} + 4 ) ^{\frac{3}{2}}} d x

ln (\frac{1}{2} x + (4 + x^{2})^{\frac{1}{2}}) - \frac{x}{( 4 + x ^{2} ) ^{\frac{1}{2}}} + C

Schritte zur Lösung

\int \frac{x ^{2}}{( x ^{2} + 4 ) ^{\frac{3}{2}}} d x

Trigonometrische Substitution anwenden

= \int tan^{2} (u) cos (u) d u

Vereinfache

tan^{2} (u) cos (u) : sin (u) tan (u)

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

Umschreiben mit Hilfe von Trigonometrie-Identitäten

= \int \frac{1 - cos ^{2} ( u )}{cos ( u )} d u

Multipliziere aus

\frac{1 - cos ^{2} ( u )}{cos ( u )} : \frac{1}{cos ( u )} - cos (u)

= \int \frac{1}{cos ( u )} - cos (u) d u

Wende die Summenregel an:

\int f (x) \pm g (x) d x = \int f (x) d x \pm \int g (x) d x

= \int \frac{1}{cos ( u )} d u - \int cos (u) d u

\int \frac{1}{cos ( u )} d u = ln ∣ tan (u) + sec (u) ∣

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

= ln ∣ tan (u) + sec (u) ∣ - sin (u)

Setze in

u = arctan (\frac{1}{2} x)

ein

= ln tan (arctan (\frac{1}{2} x)) + sec (arctan (\frac{1}{2} x)) - sin (arctan (\frac{1}{2} x))

Vereinfache

ln tan (arctan (\frac{1}{2} x)) + sec (arctan (\frac{1}{2} x)) - sin (arctan (\frac{1}{2} x)) : ln (\frac{1}{2} x + (4 + x^{2})^{\frac{1}{2}}) - \frac{x}{( 4 + x ^{2} ) ^{\frac{1}{2}}}

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

Füge eine Konstante zur Lösung hinzu

= ln (\frac{1}{2} x + (4 + x^{2})^{\frac{1}{2}}) - \frac{x}{( 4 + x ^{2} ) ^{\frac{1}{2}}} + C

d er i v a t i v e f (x) = \frac{27}{5 e ^{2}} - \frac{3}{2}

\frac{d}{d x} (x + 1 (16 + 8 x + 9 x^{2}))

x y^{^{'}} + y = y^{2}, y (1) = - 7

\int \frac{169}{x ^{3} - 13 x ^{2}} d x

\frac{d}{d x} (9 x - 9 e^{x})