3.382 \(\int \frac{(a+b x^2)^{3/2}}{x^4} \, dx\)

Optimal. Leaf size=61 \[ b^{3/2} \tanh ^{-1}\left (\frac{\sqrt{b} x}{\sqrt{a+b x^2}}\right )-\frac{b \sqrt{a+b x^2}}{x}-\frac{\left (a+b x^2\right )^{3/2}}{3 x^3} \]

[Out]

-((b*Sqrt[a + b*x^2])/x) - (a + b*x^2)^(3/2)/(3*x^3) + b^(3/2)*ArcTanh[(Sqrt[b]*x)/Sqrt[a + b*x^2]]

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Rubi [A]  time = 0.0184478, antiderivative size = 61, normalized size of antiderivative = 1., number of steps used = 4, number of rules used = 3, integrand size = 15, \(\frac{\text{number of rules}}{\text{integrand size}}\) = 0.2, Rules used = {277, 217, 206} \[ b^{3/2} \tanh ^{-1}\left (\frac{\sqrt{b} x}{\sqrt{a+b x^2}}\right )-\frac{b \sqrt{a+b x^2}}{x}-\frac{\left (a+b x^2\right )^{3/2}}{3 x^3} \]

Antiderivative was successfully verified.

[In]

Int[(a + b*x^2)^(3/2)/x^4,x]

[Out]

-((b*Sqrt[a + b*x^2])/x) - (a + b*x^2)^(3/2)/(3*x^3) + b^(3/2)*ArcTanh[(Sqrt[b]*x)/Sqrt[a + b*x^2]]

Rule 277

Int[((c_.)*(x_))^(m_.)*((a_) + (b_.)*(x_)^(n_))^(p_), x_Symbol] :> Simp[((c*x)^(m + 1)*(a + b*x^n)^p)/(c*(m +
1)), x] - Dist[(b*n*p)/(c^n*(m + 1)), Int[(c*x)^(m + n)*(a + b*x^n)^(p - 1), x], x] /; FreeQ[{a, b, c}, x] &&
IGtQ[n, 0] && GtQ[p, 0] && LtQ[m, -1] &&  !ILtQ[(m + n*p + n + 1)/n, 0] && IntBinomialQ[a, b, c, n, m, p, x]

Rule 217

Int[1/Sqrt[(a_) + (b_.)*(x_)^2], x_Symbol] :> Subst[Int[1/(1 - b*x^2), x], x, x/Sqrt[a + b*x^2]] /; FreeQ[{a,
b}, x] &&  !GtQ[a, 0]

Rule 206

Int[((a_) + (b_.)*(x_)^2)^(-1), x_Symbol] :> Simp[(1*ArcTanh[(Rt[-b, 2]*x)/Rt[a, 2]])/(Rt[a, 2]*Rt[-b, 2]), x]
/; FreeQ[{a, b}, x] && NegQ[a/b] && (GtQ[a, 0] || LtQ[b, 0])

Rubi steps

\begin{align*} \int \frac{\left (a+b x^2\right )^{3/2}}{x^4} \, dx &=-\frac{\left (a+b x^2\right )^{3/2}}{3 x^3}+b \int \frac{\sqrt{a+b x^2}}{x^2} \, dx\\ &=-\frac{b \sqrt{a+b x^2}}{x}-\frac{\left (a+b x^2\right )^{3/2}}{3 x^3}+b^2 \int \frac{1}{\sqrt{a+b x^2}} \, dx\\ &=-\frac{b \sqrt{a+b x^2}}{x}-\frac{\left (a+b x^2\right )^{3/2}}{3 x^3}+b^2 \operatorname{Subst}\left (\int \frac{1}{1-b x^2} \, dx,x,\frac{x}{\sqrt{a+b x^2}}\right )\\ &=-\frac{b \sqrt{a+b x^2}}{x}-\frac{\left (a+b x^2\right )^{3/2}}{3 x^3}+b^{3/2} \tanh ^{-1}\left (\frac{\sqrt{b} x}{\sqrt{a+b x^2}}\right )\\ \end{align*}

Mathematica [C]  time = 0.0086008, size = 52, normalized size = 0.85 \[ -\frac{a \sqrt{a+b x^2} \, _2F_1\left (-\frac{3}{2},-\frac{3}{2};-\frac{1}{2};-\frac{b x^2}{a}\right )}{3 x^3 \sqrt{\frac{b x^2}{a}+1}} \]

Antiderivative was successfully verified.

[In]

Integrate[(a + b*x^2)^(3/2)/x^4,x]

[Out]

-(a*Sqrt[a + b*x^2]*Hypergeometric2F1[-3/2, -3/2, -1/2, -((b*x^2)/a)])/(3*x^3*Sqrt[1 + (b*x^2)/a])

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Maple [A]  time = 0.005, size = 92, normalized size = 1.5 \begin{align*} -{\frac{1}{3\,a{x}^{3}} \left ( b{x}^{2}+a \right ) ^{{\frac{5}{2}}}}-{\frac{2\,b}{3\,{a}^{2}x} \left ( b{x}^{2}+a \right ) ^{{\frac{5}{2}}}}+{\frac{2\,{b}^{2}x}{3\,{a}^{2}} \left ( b{x}^{2}+a \right ) ^{{\frac{3}{2}}}}+{\frac{{b}^{2}x}{a}\sqrt{b{x}^{2}+a}}+{b}^{{\frac{3}{2}}}\ln \left ( x\sqrt{b}+\sqrt{b{x}^{2}+a} \right ) \end{align*}

Verification of antiderivative is not currently implemented for this CAS.

[In]

int((b*x^2+a)^(3/2)/x^4,x)

[Out]

-1/3/a/x^3*(b*x^2+a)^(5/2)-2/3*b/a^2/x*(b*x^2+a)^(5/2)+2/3*b^2/a^2*x*(b*x^2+a)^(3/2)+b^2/a*x*(b*x^2+a)^(1/2)+b
^(3/2)*ln(x*b^(1/2)+(b*x^2+a)^(1/2))

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Maxima [F(-2)]  time = 0., size = 0, normalized size = 0. \begin{align*} \text{Exception raised: ValueError} \end{align*}

Verification of antiderivative is not currently implemented for this CAS.

[In]

integrate((b*x^2+a)^(3/2)/x^4,x, algorithm="maxima")

[Out]

Exception raised: ValueError

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Fricas [A]  time = 1.60172, size = 279, normalized size = 4.57 \begin{align*} \left [\frac{3 \, b^{\frac{3}{2}} x^{3} \log \left (-2 \, b x^{2} - 2 \, \sqrt{b x^{2} + a} \sqrt{b} x - a\right ) - 2 \,{\left (4 \, b x^{2} + a\right )} \sqrt{b x^{2} + a}}{6 \, x^{3}}, -\frac{3 \, \sqrt{-b} b x^{3} \arctan \left (\frac{\sqrt{-b} x}{\sqrt{b x^{2} + a}}\right ) +{\left (4 \, b x^{2} + a\right )} \sqrt{b x^{2} + a}}{3 \, x^{3}}\right ] \end{align*}

Verification of antiderivative is not currently implemented for this CAS.

[In]

integrate((b*x^2+a)^(3/2)/x^4,x, algorithm="fricas")

[Out]

[1/6*(3*b^(3/2)*x^3*log(-2*b*x^2 - 2*sqrt(b*x^2 + a)*sqrt(b)*x - a) - 2*(4*b*x^2 + a)*sqrt(b*x^2 + a))/x^3, -1
/3*(3*sqrt(-b)*b*x^3*arctan(sqrt(-b)*x/sqrt(b*x^2 + a)) + (4*b*x^2 + a)*sqrt(b*x^2 + a))/x^3]

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Sympy [A]  time = 1.97584, size = 78, normalized size = 1.28 \begin{align*} - \frac{a \sqrt{b} \sqrt{\frac{a}{b x^{2}} + 1}}{3 x^{2}} - \frac{4 b^{\frac{3}{2}} \sqrt{\frac{a}{b x^{2}} + 1}}{3} - \frac{b^{\frac{3}{2}} \log{\left (\frac{a}{b x^{2}} \right )}}{2} + b^{\frac{3}{2}} \log{\left (\sqrt{\frac{a}{b x^{2}} + 1} + 1 \right )} \end{align*}

Verification of antiderivative is not currently implemented for this CAS.

[In]

integrate((b*x**2+a)**(3/2)/x**4,x)

[Out]

-a*sqrt(b)*sqrt(a/(b*x**2) + 1)/(3*x**2) - 4*b**(3/2)*sqrt(a/(b*x**2) + 1)/3 - b**(3/2)*log(a/(b*x**2))/2 + b*
*(3/2)*log(sqrt(a/(b*x**2) + 1) + 1)

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Giac [B]  time = 2.90562, size = 154, normalized size = 2.52 \begin{align*} -\frac{1}{2} \, b^{\frac{3}{2}} \log \left ({\left (\sqrt{b} x - \sqrt{b x^{2} + a}\right )}^{2}\right ) + \frac{4 \,{\left (3 \,{\left (\sqrt{b} x - \sqrt{b x^{2} + a}\right )}^{4} a b^{\frac{3}{2}} - 3 \,{\left (\sqrt{b} x - \sqrt{b x^{2} + a}\right )}^{2} a^{2} b^{\frac{3}{2}} + 2 \, a^{3} b^{\frac{3}{2}}\right )}}{3 \,{\left ({\left (\sqrt{b} x - \sqrt{b x^{2} + a}\right )}^{2} - a\right )}^{3}} \end{align*}

Verification of antiderivative is not currently implemented for this CAS.

[In]

integrate((b*x^2+a)^(3/2)/x^4,x, algorithm="giac")

[Out]

-1/2*b^(3/2)*log((sqrt(b)*x - sqrt(b*x^2 + a))^2) + 4/3*(3*(sqrt(b)*x - sqrt(b*x^2 + a))^4*a*b^(3/2) - 3*(sqrt
(b)*x - sqrt(b*x^2 + a))^2*a^2*b^(3/2) + 2*a^3*b^(3/2))/((sqrt(b)*x - sqrt(b*x^2 + a))^2 - a)^3