3.218 \(\int \frac{A+B x^3}{x^7 \sqrt{a+b x^3}} \, dx\)

Optimal. Leaf size=90 \[ \frac{\sqrt{a+b x^3} (3 A b-4 a B)}{12 a^2 x^3}-\frac{b (3 A b-4 a B) \tanh ^{-1}\left (\frac{\sqrt{a+b x^3}}{\sqrt{a}}\right )}{12 a^{5/2}}-\frac{A \sqrt{a+b x^3}}{6 a x^6} \]

[Out]

-(A*Sqrt[a + b*x^3])/(6*a*x^6) + ((3*A*b - 4*a*B)*Sqrt[a + b*x^3])/(12*a^2*x^3) - (b*(3*A*b - 4*a*B)*ArcTanh[S
qrt[a + b*x^3]/Sqrt[a]])/(12*a^(5/2))

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Rubi [A]  time = 0.0695414, antiderivative size = 90, normalized size of antiderivative = 1., number of steps used = 5, number of rules used = 5, integrand size = 22, \(\frac{\text{number of rules}}{\text{integrand size}}\) = 0.227, Rules used = {446, 78, 51, 63, 208} \[ \frac{\sqrt{a+b x^3} (3 A b-4 a B)}{12 a^2 x^3}-\frac{b (3 A b-4 a B) \tanh ^{-1}\left (\frac{\sqrt{a+b x^3}}{\sqrt{a}}\right )}{12 a^{5/2}}-\frac{A \sqrt{a+b x^3}}{6 a x^6} \]

Antiderivative was successfully verified.

[In]

Int[(A + B*x^3)/(x^7*Sqrt[a + b*x^3]),x]

[Out]

-(A*Sqrt[a + b*x^3])/(6*a*x^6) + ((3*A*b - 4*a*B)*Sqrt[a + b*x^3])/(12*a^2*x^3) - (b*(3*A*b - 4*a*B)*ArcTanh[S
qrt[a + b*x^3]/Sqrt[a]])/(12*a^(5/2))

Rule 446

Int[(x_)^(m_.)*((a_) + (b_.)*(x_)^(n_))^(p_.)*((c_) + (d_.)*(x_)^(n_))^(q_.), x_Symbol] :> Dist[1/n, Subst[Int
[x^(Simplify[(m + 1)/n] - 1)*(a + b*x)^p*(c + d*x)^q, x], x, x^n], x] /; FreeQ[{a, b, c, d, m, n, p, q}, x] &&
NeQ[b*c - a*d, 0] && IntegerQ[Simplify[(m + 1)/n]]

Rule 78

Int[((a_.) + (b_.)*(x_))*((c_.) + (d_.)*(x_))^(n_.)*((e_.) + (f_.)*(x_))^(p_.), x_Symbol] :> -Simp[((b*e - a*f
)*(c + d*x)^(n + 1)*(e + f*x)^(p + 1))/(f*(p + 1)*(c*f - d*e)), x] - Dist[(a*d*f*(n + p + 2) - b*(d*e*(n + 1)
+ c*f*(p + 1)))/(f*(p + 1)*(c*f - d*e)), Int[(c + d*x)^n*(e + f*x)^(p + 1), x], x] /; FreeQ[{a, b, c, d, e, f,
n}, x] && LtQ[p, -1] && ( !LtQ[n, -1] || IntegerQ[p] ||  !(IntegerQ[n] ||  !(EqQ[e, 0] ||  !(EqQ[c, 0] || LtQ
[p, n]))))

Rule 51

Int[((a_.) + (b_.)*(x_))^(m_)*((c_.) + (d_.)*(x_))^(n_), x_Symbol] :> Simp[((a + b*x)^(m + 1)*(c + d*x)^(n + 1
))/((b*c - a*d)*(m + 1)), x] - Dist[(d*(m + n + 2))/((b*c - a*d)*(m + 1)), Int[(a + b*x)^(m + 1)*(c + d*x)^n,
x], x] /; FreeQ[{a, b, c, d, n}, x] && NeQ[b*c - a*d, 0] && LtQ[m, -1] &&  !(LtQ[n, -1] && (EqQ[a, 0] || (NeQ[
c, 0] && LtQ[m - n, 0] && IntegerQ[n]))) && IntLinearQ[a, b, c, d, m, n, x]

Rule 63

Int[((a_.) + (b_.)*(x_))^(m_)*((c_.) + (d_.)*(x_))^(n_), x_Symbol] :> With[{p = Denominator[m]}, Dist[p/b, Sub
st[Int[x^(p*(m + 1) - 1)*(c - (a*d)/b + (d*x^p)/b)^n, x], x, (a + b*x)^(1/p)], x]] /; FreeQ[{a, b, c, d}, x] &
& NeQ[b*c - a*d, 0] && LtQ[-1, m, 0] && LeQ[-1, n, 0] && LeQ[Denominator[n], Denominator[m]] && IntLinearQ[a,
b, c, d, m, n, x]

Rule 208

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

Rubi steps

\begin{align*} \int \frac{A+B x^3}{x^7 \sqrt{a+b x^3}} \, dx &=\frac{1}{3} \operatorname{Subst}\left (\int \frac{A+B x}{x^3 \sqrt{a+b x}} \, dx,x,x^3\right )\\ &=-\frac{A \sqrt{a+b x^3}}{6 a x^6}+\frac{\left (-\frac{3 A b}{2}+2 a B\right ) \operatorname{Subst}\left (\int \frac{1}{x^2 \sqrt{a+b x}} \, dx,x,x^3\right )}{6 a}\\ &=-\frac{A \sqrt{a+b x^3}}{6 a x^6}+\frac{(3 A b-4 a B) \sqrt{a+b x^3}}{12 a^2 x^3}+\frac{(b (3 A b-4 a B)) \operatorname{Subst}\left (\int \frac{1}{x \sqrt{a+b x}} \, dx,x,x^3\right )}{24 a^2}\\ &=-\frac{A \sqrt{a+b x^3}}{6 a x^6}+\frac{(3 A b-4 a B) \sqrt{a+b x^3}}{12 a^2 x^3}+\frac{(3 A b-4 a B) \operatorname{Subst}\left (\int \frac{1}{-\frac{a}{b}+\frac{x^2}{b}} \, dx,x,\sqrt{a+b x^3}\right )}{12 a^2}\\ &=-\frac{A \sqrt{a+b x^3}}{6 a x^6}+\frac{(3 A b-4 a B) \sqrt{a+b x^3}}{12 a^2 x^3}-\frac{b (3 A b-4 a B) \tanh ^{-1}\left (\frac{\sqrt{a+b x^3}}{\sqrt{a}}\right )}{12 a^{5/2}}\\ \end{align*}

Mathematica [A]  time = 0.205633, size = 81, normalized size = 0.9 \[ \frac{\sqrt{a+b x^3} \left (b \left (2 a B-\frac{3 A b}{2}\right ) \left (\frac{\tanh ^{-1}\left (\sqrt{\frac{b x^3}{a}+1}\right )}{\sqrt{\frac{b x^3}{a}+1}}-\frac{a}{b x^3}\right )-\frac{a^2 A}{x^6}\right )}{6 a^3} \]

Antiderivative was successfully verified.

[In]

Integrate[(A + B*x^3)/(x^7*Sqrt[a + b*x^3]),x]

[Out]

(Sqrt[a + b*x^3]*(-((a^2*A)/x^6) + b*((-3*A*b)/2 + 2*a*B)*(-(a/(b*x^3)) + ArcTanh[Sqrt[1 + (b*x^3)/a]]/Sqrt[1
+ (b*x^3)/a])))/(6*a^3)

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Maple [A]  time = 0.022, size = 102, normalized size = 1.1 \begin{align*} A \left ( -{\frac{1}{6\,a{x}^{6}}\sqrt{b{x}^{3}+a}}+{\frac{b}{4\,{a}^{2}{x}^{3}}\sqrt{b{x}^{3}+a}}-{\frac{{b}^{2}}{4}{\it Artanh} \left ({\sqrt{b{x}^{3}+a}{\frac{1}{\sqrt{a}}}} \right ){a}^{-{\frac{5}{2}}}} \right ) +B \left ( -{\frac{1}{3\,a{x}^{3}}\sqrt{b{x}^{3}+a}}+{\frac{b}{3}{\it Artanh} \left ({\sqrt{b{x}^{3}+a}{\frac{1}{\sqrt{a}}}} \right ){a}^{-{\frac{3}{2}}}} \right ) \end{align*}

Verification of antiderivative is not currently implemented for this CAS.

[In]

int((B*x^3+A)/x^7/(b*x^3+a)^(1/2),x)

[Out]

A*(-1/6/a*(b*x^3+a)^(1/2)/x^6+1/4/a^2*b*(b*x^3+a)^(1/2)/x^3-1/4*b^2/a^(5/2)*arctanh((b*x^3+a)^(1/2)/a^(1/2)))+
B*(-1/3/a*(b*x^3+a)^(1/2)/x^3+1/3*b/a^(3/2)*arctanh((b*x^3+a)^(1/2)/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^3+A)/x^7/(b*x^3+a)^(1/2),x, algorithm="maxima")

[Out]

Exception raised: ValueError

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Fricas [A]  time = 1.82213, size = 409, normalized size = 4.54 \begin{align*} \left [-\frac{{\left (4 \, B a b - 3 \, A b^{2}\right )} \sqrt{a} x^{6} \log \left (\frac{b x^{3} - 2 \, \sqrt{b x^{3} + a} \sqrt{a} + 2 \, a}{x^{3}}\right ) + 2 \,{\left ({\left (4 \, B a^{2} - 3 \, A a b\right )} x^{3} + 2 \, A a^{2}\right )} \sqrt{b x^{3} + a}}{24 \, a^{3} x^{6}}, -\frac{{\left (4 \, B a b - 3 \, A b^{2}\right )} \sqrt{-a} x^{6} \arctan \left (\frac{\sqrt{b x^{3} + a} \sqrt{-a}}{a}\right ) +{\left ({\left (4 \, B a^{2} - 3 \, A a b\right )} x^{3} + 2 \, A a^{2}\right )} \sqrt{b x^{3} + a}}{12 \, a^{3} x^{6}}\right ] \end{align*}

Verification of antiderivative is not currently implemented for this CAS.

[In]

integrate((B*x^3+A)/x^7/(b*x^3+a)^(1/2),x, algorithm="fricas")

[Out]

[-1/24*((4*B*a*b - 3*A*b^2)*sqrt(a)*x^6*log((b*x^3 - 2*sqrt(b*x^3 + a)*sqrt(a) + 2*a)/x^3) + 2*((4*B*a^2 - 3*A
*a*b)*x^3 + 2*A*a^2)*sqrt(b*x^3 + a))/(a^3*x^6), -1/12*((4*B*a*b - 3*A*b^2)*sqrt(-a)*x^6*arctan(sqrt(b*x^3 + a
)*sqrt(-a)/a) + ((4*B*a^2 - 3*A*a*b)*x^3 + 2*A*a^2)*sqrt(b*x^3 + a))/(a^3*x^6)]

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Sympy [B]  time = 31.3192, size = 163, normalized size = 1.81 \begin{align*} - \frac{A}{6 \sqrt{b} x^{\frac{15}{2}} \sqrt{\frac{a}{b x^{3}} + 1}} + \frac{A \sqrt{b}}{12 a x^{\frac{9}{2}} \sqrt{\frac{a}{b x^{3}} + 1}} + \frac{A b^{\frac{3}{2}}}{4 a^{2} x^{\frac{3}{2}} \sqrt{\frac{a}{b x^{3}} + 1}} - \frac{A b^{2} \operatorname{asinh}{\left (\frac{\sqrt{a}}{\sqrt{b} x^{\frac{3}{2}}} \right )}}{4 a^{\frac{5}{2}}} - \frac{B \sqrt{b} \sqrt{\frac{a}{b x^{3}} + 1}}{3 a x^{\frac{3}{2}}} + \frac{B b \operatorname{asinh}{\left (\frac{\sqrt{a}}{\sqrt{b} x^{\frac{3}{2}}} \right )}}{3 a^{\frac{3}{2}}} \end{align*}

Verification of antiderivative is not currently implemented for this CAS.

[In]

integrate((B*x**3+A)/x**7/(b*x**3+a)**(1/2),x)

[Out]

-A/(6*sqrt(b)*x**(15/2)*sqrt(a/(b*x**3) + 1)) + A*sqrt(b)/(12*a*x**(9/2)*sqrt(a/(b*x**3) + 1)) + A*b**(3/2)/(4
*a**2*x**(3/2)*sqrt(a/(b*x**3) + 1)) - A*b**2*asinh(sqrt(a)/(sqrt(b)*x**(3/2)))/(4*a**(5/2)) - B*sqrt(b)*sqrt(
a/(b*x**3) + 1)/(3*a*x**(3/2)) + B*b*asinh(sqrt(a)/(sqrt(b)*x**(3/2)))/(3*a**(3/2))

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Giac [A]  time = 1.1216, size = 163, normalized size = 1.81 \begin{align*} -\frac{\frac{{\left (4 \, B a b^{2} - 3 \, A b^{3}\right )} \arctan \left (\frac{\sqrt{b x^{3} + a}}{\sqrt{-a}}\right )}{\sqrt{-a} a^{2}} + \frac{4 \,{\left (b x^{3} + a\right )}^{\frac{3}{2}} B a b^{2} - 4 \, \sqrt{b x^{3} + a} B a^{2} b^{2} - 3 \,{\left (b x^{3} + a\right )}^{\frac{3}{2}} A b^{3} + 5 \, \sqrt{b x^{3} + a} A a b^{3}}{a^{2} b^{2} x^{6}}}{12 \, b} \end{align*}

Verification of antiderivative is not currently implemented for this CAS.

[In]

integrate((B*x^3+A)/x^7/(b*x^3+a)^(1/2),x, algorithm="giac")

[Out]

-1/12*((4*B*a*b^2 - 3*A*b^3)*arctan(sqrt(b*x^3 + a)/sqrt(-a))/(sqrt(-a)*a^2) + (4*(b*x^3 + a)^(3/2)*B*a*b^2 -
4*sqrt(b*x^3 + a)*B*a^2*b^2 - 3*(b*x^3 + a)^(3/2)*A*b^3 + 5*sqrt(b*x^3 + a)*A*a*b^3)/(a^2*b^2*x^6))/b