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

Optimal. Leaf size=114 \[ \frac{\log \left (a^{2/3}+\sqrt [3]{a} \sqrt [3]{b} x+b^{2/3} x^2\right )}{6 a^{2/3} \sqrt [3]{b}}-\frac{\log \left (\sqrt [3]{a}-\sqrt [3]{b} x\right )}{3 a^{2/3} \sqrt [3]{b}}+\frac{\tan ^{-1}\left (\frac{\sqrt [3]{a}+2 \sqrt [3]{b} x}{\sqrt{3} \sqrt [3]{a}}\right )}{\sqrt{3} a^{2/3} \sqrt [3]{b}} \]

[Out]

ArcTan[(a^(1/3) + 2*b^(1/3)*x)/(Sqrt[3]*a^(1/3))]/(Sqrt[3]*a^(2/3)*b^(1/3)) - Lo
g[a^(1/3) - b^(1/3)*x]/(3*a^(2/3)*b^(1/3)) + Log[a^(2/3) + a^(1/3)*b^(1/3)*x + b
^(2/3)*x^2]/(6*a^(2/3)*b^(1/3))

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Rubi [A]  time = 0.102366, antiderivative size = 114, normalized size of antiderivative = 1., number of steps used = 6, number of rules used = 6, integrand size = 10, \(\frac{\text{number of rules}}{\text{integrand size}}\) = 0.6 \[ \frac{\log \left (a^{2/3}+\sqrt [3]{a} \sqrt [3]{b} x+b^{2/3} x^2\right )}{6 a^{2/3} \sqrt [3]{b}}-\frac{\log \left (\sqrt [3]{a}-\sqrt [3]{b} x\right )}{3 a^{2/3} \sqrt [3]{b}}+\frac{\tan ^{-1}\left (\frac{\sqrt [3]{a}+2 \sqrt [3]{b} x}{\sqrt{3} \sqrt [3]{a}}\right )}{\sqrt{3} a^{2/3} \sqrt [3]{b}} \]

Antiderivative was successfully verified.

[In]  Int[(a - b*x^3)^(-1),x]

[Out]

ArcTan[(a^(1/3) + 2*b^(1/3)*x)/(Sqrt[3]*a^(1/3))]/(Sqrt[3]*a^(2/3)*b^(1/3)) - Lo
g[a^(1/3) - b^(1/3)*x]/(3*a^(2/3)*b^(1/3)) + Log[a^(2/3) + a^(1/3)*b^(1/3)*x + b
^(2/3)*x^2]/(6*a^(2/3)*b^(1/3))

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Rubi in Sympy [A]  time = 22.0585, size = 109, normalized size = 0.96 \[ - \frac{\log{\left (\sqrt [3]{a} - \sqrt [3]{b} x \right )}}{3 a^{\frac{2}{3}} \sqrt [3]{b}} + \frac{\log{\left (a^{\frac{2}{3}} + \sqrt [3]{a} \sqrt [3]{b} x + b^{\frac{2}{3}} x^{2} \right )}}{6 a^{\frac{2}{3}} \sqrt [3]{b}} + \frac{\sqrt{3} \operatorname{atan}{\left (\frac{\sqrt{3} \left (\frac{\sqrt [3]{a}}{3} + \frac{2 \sqrt [3]{b} x}{3}\right )}{\sqrt [3]{a}} \right )}}{3 a^{\frac{2}{3}} \sqrt [3]{b}} \]

Verification of antiderivative is not currently implemented for this CAS.

[In]  rubi_integrate(1/(-b*x**3+a),x)

[Out]

-log(a**(1/3) - b**(1/3)*x)/(3*a**(2/3)*b**(1/3)) + log(a**(2/3) + a**(1/3)*b**(
1/3)*x + b**(2/3)*x**2)/(6*a**(2/3)*b**(1/3)) + sqrt(3)*atan(sqrt(3)*(a**(1/3)/3
+ 2*b**(1/3)*x/3)/a**(1/3))/(3*a**(2/3)*b**(1/3))

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Mathematica [A]  time = 0.0192223, size = 89, normalized size = 0.78 \[ \frac{\log \left (a^{2/3}+\sqrt [3]{a} \sqrt [3]{b} x+b^{2/3} x^2\right )-2 \log \left (\sqrt [3]{a}-\sqrt [3]{b} x\right )+2 \sqrt{3} \tan ^{-1}\left (\frac{\frac{2 \sqrt [3]{b} x}{\sqrt [3]{a}}+1}{\sqrt{3}}\right )}{6 a^{2/3} \sqrt [3]{b}} \]

Antiderivative was successfully verified.

[In]  Integrate[(a - b*x^3)^(-1),x]

[Out]

(2*Sqrt[3]*ArcTan[(1 + (2*b^(1/3)*x)/a^(1/3))/Sqrt[3]] - 2*Log[a^(1/3) - b^(1/3)
*x] + Log[a^(2/3) + a^(1/3)*b^(1/3)*x + b^(2/3)*x^2])/(6*a^(2/3)*b^(1/3))

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Maple [A]  time = 0.002, size = 92, normalized size = 0.8 \[ -{\frac{1}{3\,b}\ln \left ( x-\sqrt [3]{{\frac{a}{b}}} \right ) \left ({\frac{a}{b}} \right ) ^{-{\frac{2}{3}}}}+{\frac{1}{6\,b}\ln \left ({x}^{2}+x\sqrt [3]{{\frac{a}{b}}}+ \left ({\frac{a}{b}} \right ) ^{{\frac{2}{3}}} \right ) \left ({\frac{a}{b}} \right ) ^{-{\frac{2}{3}}}}+{\frac{\sqrt{3}}{3\,b}\arctan \left ({\frac{\sqrt{3}}{3} \left ( 2\,{x{\frac{1}{\sqrt [3]{{\frac{a}{b}}}}}}+1 \right ) } \right ) \left ({\frac{a}{b}} \right ) ^{-{\frac{2}{3}}}} \]

Verification of antiderivative is not currently implemented for this CAS.

[In]  int(1/(-b*x^3+a),x)

[Out]

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

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Maxima [F]  time = 0., size = 0, normalized size = 0. \[ \text{Exception raised: ValueError} \]

Verification of antiderivative is not currently implemented for this CAS.

[In]  integrate(-1/(b*x^3 - a),x, algorithm="maxima")

[Out]

Exception raised: ValueError

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Fricas [A]  time = 0.220552, size = 127, normalized size = 1.11 \[ -\frac{\sqrt{3}{\left (\sqrt{3} \log \left (\left (-a^{2} b\right )^{\frac{2}{3}} x^{2} - \left (-a^{2} b\right )^{\frac{1}{3}} a x + a^{2}\right ) - 2 \, \sqrt{3} \log \left (\left (-a^{2} b\right )^{\frac{1}{3}} x + a\right ) - 6 \, \arctan \left (\frac{2 \, \sqrt{3} \left (-a^{2} b\right )^{\frac{1}{3}} x - \sqrt{3} a}{3 \, a}\right )\right )}}{18 \, \left (-a^{2} b\right )^{\frac{1}{3}}} \]

Verification of antiderivative is not currently implemented for this CAS.

[In]  integrate(-1/(b*x^3 - a),x, algorithm="fricas")

[Out]

-1/18*sqrt(3)*(sqrt(3)*log((-a^2*b)^(2/3)*x^2 - (-a^2*b)^(1/3)*a*x + a^2) - 2*sq
rt(3)*log((-a^2*b)^(1/3)*x + a) - 6*arctan(1/3*(2*sqrt(3)*(-a^2*b)^(1/3)*x - sqr
t(3)*a)/a))/(-a^2*b)^(1/3)

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Sympy [A]  time = 0.368792, size = 22, normalized size = 0.19 \[ - \operatorname{RootSum}{\left (27 t^{3} a^{2} b - 1, \left ( t \mapsto t \log{\left (- 3 t a + x \right )} \right )\right )} \]

Verification of antiderivative is not currently implemented for this CAS.

[In]  integrate(1/(-b*x**3+a),x)

[Out]

-RootSum(27*_t**3*a**2*b - 1, Lambda(_t, _t*log(-3*_t*a + x)))

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GIAC/XCAS [A]  time = 0.220828, size = 140, normalized size = 1.23 \[ -\frac{\left (\frac{a}{b}\right )^{\frac{1}{3}}{\rm ln}\left ({\left | x - \left (\frac{a}{b}\right )^{\frac{1}{3}} \right |}\right )}{3 \, a} + \frac{\sqrt{3} \left (a b^{2}\right )^{\frac{1}{3}} \arctan \left (\frac{\sqrt{3}{\left (2 \, x + \left (\frac{a}{b}\right )^{\frac{1}{3}}\right )}}{3 \, \left (\frac{a}{b}\right )^{\frac{1}{3}}}\right )}{3 \, a b} + \frac{\left (a b^{2}\right )^{\frac{1}{3}}{\rm ln}\left (x^{2} + x \left (\frac{a}{b}\right )^{\frac{1}{3}} + \left (\frac{a}{b}\right )^{\frac{2}{3}}\right )}{6 \, a b} \]

Verification of antiderivative is not currently implemented for this CAS.

[In]  integrate(-1/(b*x^3 - a),x, algorithm="giac")

[Out]

-1/3*(a/b)^(1/3)*ln(abs(x - (a/b)^(1/3)))/a + 1/3*sqrt(3)*(a*b^2)^(1/3)*arctan(1
/3*sqrt(3)*(2*x + (a/b)^(1/3))/(a/b)^(1/3))/(a*b) + 1/6*(a*b^2)^(1/3)*ln(x^2 + x
*(a/b)^(1/3) + (a/b)^(2/3))/(a*b)