3.356 \(\int \frac {1}{x^4 (a-b x^3)} \, dx\)

Optimal. Leaf size=35 \[ -\frac {b \log \left (a-b x^3\right )}{3 a^2}+\frac {b \log (x)}{a^2}-\frac {1}{3 a x^3} \]

[Out]

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

________________________________________________________________________________________

Rubi [A]  time = 0.02, antiderivative size = 35, normalized size of antiderivative = 1.00, number of steps used = 3, number of rules used = 2, integrand size = 14, \(\frac {\text {number of rules}}{\text {integrand size}}\) = 0.143, Rules used = {266, 44} \[ -\frac {b \log \left (a-b x^3\right )}{3 a^2}+\frac {b \log (x)}{a^2}-\frac {1}{3 a x^3} \]

Antiderivative was successfully verified.

[In]

Int[1/(x^4*(a - b*x^3)),x]

[Out]

-1/(3*a*x^3) + (b*Log[x])/a^2 - (b*Log[a - b*x^3])/(3*a^2)

Rule 44

Int[((a_) + (b_.)*(x_))^(m_.)*((c_.) + (d_.)*(x_))^(n_.), x_Symbol] :> Int[ExpandIntegrand[(a + b*x)^m*(c + d*
x)^n, x], x] /; FreeQ[{a, b, c, d}, x] && NeQ[b*c - a*d, 0] && ILtQ[m, 0] && IntegerQ[n] &&  !(IGtQ[n, 0] && L
tQ[m + n + 2, 0])

Rule 266

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

Rubi steps

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

________________________________________________________________________________________

Mathematica [A]  time = 0.01, size = 35, normalized size = 1.00 \[ -\frac {b \log \left (a-b x^3\right )}{3 a^2}+\frac {b \log (x)}{a^2}-\frac {1}{3 a x^3} \]

Antiderivative was successfully verified.

[In]

Integrate[1/(x^4*(a - b*x^3)),x]

[Out]

-1/3*1/(a*x^3) + (b*Log[x])/a^2 - (b*Log[a - b*x^3])/(3*a^2)

________________________________________________________________________________________

fricas [A]  time = 0.85, size = 33, normalized size = 0.94 \[ -\frac {b x^{3} \log \left (b x^{3} - a\right ) - 3 \, b x^{3} \log \relax (x) + a}{3 \, a^{2} x^{3}} \]

Verification of antiderivative is not currently implemented for this CAS.

[In]

integrate(1/x^4/(-b*x^3+a),x, algorithm="fricas")

[Out]

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

________________________________________________________________________________________

giac [A]  time = 0.21, size = 41, normalized size = 1.17 \[ -\frac {b \log \left ({\left | b x^{3} - a \right |}\right )}{3 \, a^{2}} + \frac {b \log \left ({\left | x \right |}\right )}{a^{2}} - \frac {b x^{3} + a}{3 \, a^{2} x^{3}} \]

Verification of antiderivative is not currently implemented for this CAS.

[In]

integrate(1/x^4/(-b*x^3+a),x, algorithm="giac")

[Out]

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

________________________________________________________________________________________

maple [A]  time = 0.01, size = 33, normalized size = 0.94 \[ \frac {b \ln \relax (x )}{a^{2}}-\frac {b \ln \left (b \,x^{3}-a \right )}{3 a^{2}}-\frac {1}{3 a \,x^{3}} \]

Verification of antiderivative is not currently implemented for this CAS.

[In]

int(1/x^4/(-b*x^3+a),x)

[Out]

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

________________________________________________________________________________________

maxima [A]  time = 1.32, size = 35, normalized size = 1.00 \[ -\frac {b \log \left (b x^{3} - a\right )}{3 \, a^{2}} + \frac {b \log \left (x^{3}\right )}{3 \, a^{2}} - \frac {1}{3 \, a x^{3}} \]

Verification of antiderivative is not currently implemented for this CAS.

[In]

integrate(1/x^4/(-b*x^3+a),x, algorithm="maxima")

[Out]

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

________________________________________________________________________________________

mupad [B]  time = 0.07, size = 31, normalized size = 0.89 \[ \frac {b\,\ln \relax (x)}{a^2}-\frac {b\,\ln \left (a-b\,x^3\right )}{3\,a^2}-\frac {1}{3\,a\,x^3} \]

Verification of antiderivative is not currently implemented for this CAS.

[In]

int(1/(x^4*(a - b*x^3)),x)

[Out]

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

________________________________________________________________________________________

sympy [A]  time = 0.43, size = 31, normalized size = 0.89 \[ - \frac {1}{3 a x^{3}} + \frac {b \log {\relax (x )}}{a^{2}} - \frac {b \log {\left (- \frac {a}{b} + x^{3} \right )}}{3 a^{2}} \]

Verification of antiderivative is not currently implemented for this CAS.

[In]

integrate(1/x**4/(-b*x**3+a),x)

[Out]

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

________________________________________________________________________________________