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

Optimal. Leaf size=69 \[ \frac{A b-a B}{3 a^2 x^3}-\frac{b (A b-a B) \log \left (a+b x^3\right )}{3 a^3}+\frac{b \log (x) (A b-a B)}{a^3}-\frac{A}{6 a x^6} \]

[Out]

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

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Rubi [A]  time = 0.0640418, antiderivative size = 69, normalized size of antiderivative = 1., number of steps used = 3, number of rules used = 2, integrand size = 20, \(\frac{\text{number of rules}}{\text{integrand size}}\) = 0.1, Rules used = {446, 77} \[ \frac{A b-a B}{3 a^2 x^3}-\frac{b (A b-a B) \log \left (a+b x^3\right )}{3 a^3}+\frac{b \log (x) (A b-a B)}{a^3}-\frac{A}{6 a x^6} \]

Antiderivative was successfully verified.

[In]

Int[(A + B*x^3)/(x^7*(a + b*x^3)),x]

[Out]

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

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 77

Int[((a_.) + (b_.)*(x_))*((c_) + (d_.)*(x_))^(n_.)*((e_.) + (f_.)*(x_))^(p_.), x_Symbol] :> Int[ExpandIntegran
d[(a + b*x)*(c + d*x)^n*(e + f*x)^p, x], x] /; FreeQ[{a, b, c, d, e, f, n}, x] && NeQ[b*c - a*d, 0] && ((ILtQ[
n, 0] && ILtQ[p, 0]) || EqQ[p, 1] || (IGtQ[p, 0] && ( !IntegerQ[n] || LeQ[9*p + 5*(n + 2), 0] || GeQ[n + p + 1
, 0] || (GeQ[n + p + 2, 0] && RationalQ[a, b, c, d, e, f]))))

Rubi steps

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

Mathematica [A]  time = 0.0284331, size = 70, normalized size = 1.01 \[ \frac{-a \left (a A+2 a B x^3-2 A b x^3\right )+6 b x^6 \log (x) (A b-a B)+2 b x^6 (a B-A b) \log \left (a+b x^3\right )}{6 a^3 x^6} \]

Antiderivative was successfully verified.

[In]

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

[Out]

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

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Maple [A]  time = 0.007, size = 81, normalized size = 1.2 \begin{align*} -{\frac{{b}^{2}\ln \left ( b{x}^{3}+a \right ) A}{3\,{a}^{3}}}+{\frac{b\ln \left ( b{x}^{3}+a \right ) B}{3\,{a}^{2}}}-{\frac{A}{6\,a{x}^{6}}}+{\frac{Ab}{3\,{a}^{2}{x}^{3}}}-{\frac{B}{3\,a{x}^{3}}}+{\frac{A\ln \left ( x \right ){b}^{2}}{{a}^{3}}}-{\frac{bB\ln \left ( x \right ) }{{a}^{2}}} \end{align*}

Verification of antiderivative is not currently implemented for this CAS.

[In]

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

[Out]

-1/3*b^2/a^3*ln(b*x^3+a)*A+1/3*b/a^2*ln(b*x^3+a)*B-1/6*A/a/x^6+1/3/a^2/x^3*A*b-1/3/a/x^3*B+1/a^3*b^2*ln(x)*A-1
/a^2*b*ln(x)*B

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Maxima [A]  time = 1.36767, size = 95, normalized size = 1.38 \begin{align*} \frac{{\left (B a b - A b^{2}\right )} \log \left (b x^{3} + a\right )}{3 \, a^{3}} - \frac{{\left (B a b - A b^{2}\right )} \log \left (x^{3}\right )}{3 \, a^{3}} - \frac{2 \,{\left (B a - A b\right )} x^{3} + A a}{6 \, a^{2} x^{6}} \end{align*}

Verification of antiderivative is not currently implemented for this CAS.

[In]

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

[Out]

1/3*(B*a*b - A*b^2)*log(b*x^3 + a)/a^3 - 1/3*(B*a*b - A*b^2)*log(x^3)/a^3 - 1/6*(2*(B*a - A*b)*x^3 + A*a)/(a^2
*x^6)

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Fricas [A]  time = 1.58467, size = 158, normalized size = 2.29 \begin{align*} \frac{2 \,{\left (B a b - A b^{2}\right )} x^{6} \log \left (b x^{3} + a\right ) - 6 \,{\left (B a b - A b^{2}\right )} x^{6} \log \left (x\right ) - 2 \,{\left (B a^{2} - A a b\right )} x^{3} - A a^{2}}{6 \, a^{3} x^{6}} \end{align*}

Verification of antiderivative is not currently implemented for this CAS.

[In]

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

[Out]

1/6*(2*(B*a*b - A*b^2)*x^6*log(b*x^3 + a) - 6*(B*a*b - A*b^2)*x^6*log(x) - 2*(B*a^2 - A*a*b)*x^3 - A*a^2)/(a^3
*x^6)

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Sympy [A]  time = 2.77085, size = 61, normalized size = 0.88 \begin{align*} - \frac{A a + x^{3} \left (- 2 A b + 2 B a\right )}{6 a^{2} x^{6}} - \frac{b \left (- A b + B a\right ) \log{\left (x \right )}}{a^{3}} + \frac{b \left (- A b + B a\right ) \log{\left (\frac{a}{b} + x^{3} \right )}}{3 a^{3}} \end{align*}

Verification of antiderivative is not currently implemented for this CAS.

[In]

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

[Out]

-(A*a + x**3*(-2*A*b + 2*B*a))/(6*a**2*x**6) - b*(-A*b + B*a)*log(x)/a**3 + b*(-A*b + B*a)*log(a/b + x**3)/(3*
a**3)

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Giac [A]  time = 1.12729, size = 134, normalized size = 1.94 \begin{align*} -\frac{{\left (B a b - A b^{2}\right )} \log \left ({\left | x \right |}\right )}{a^{3}} + \frac{{\left (B a b^{2} - A b^{3}\right )} \log \left ({\left | b x^{3} + a \right |}\right )}{3 \, a^{3} b} + \frac{3 \, B a b x^{6} - 3 \, A b^{2} x^{6} - 2 \, B a^{2} x^{3} + 2 \, A a b x^{3} - A a^{2}}{6 \, a^{3} x^{6}} \end{align*}

Verification of antiderivative is not currently implemented for this CAS.

[In]

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

[Out]

-(B*a*b - A*b^2)*log(abs(x))/a^3 + 1/3*(B*a*b^2 - A*b^3)*log(abs(b*x^3 + a))/(a^3*b) + 1/6*(3*B*a*b*x^6 - 3*A*
b^2*x^6 - 2*B*a^2*x^3 + 2*A*a*b*x^3 - A*a^2)/(a^3*x^6)