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

Optimal. Leaf size=138 \[ \frac{\log \left (-\sqrt [3]{1-a} \sqrt [3]{b} x+(1-a)^{2/3}+b^{2/3} x^2\right )}{6 (1-a)^{2/3} \sqrt [3]{b}}-\frac{\log \left (\sqrt [3]{1-a}+\sqrt [3]{b} x\right )}{3 (1-a)^{2/3} \sqrt [3]{b}}+\frac{\tan ^{-1}\left (\frac{1-\frac{2 \sqrt [3]{b} x}{\sqrt [3]{1-a}}}{\sqrt{3}}\right )}{\sqrt{3} (1-a)^{2/3} \sqrt [3]{b}} \]

[Out]

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

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Rubi [A]  time = 0.154104, antiderivative size = 138, normalized size of antiderivative = 1., number of steps used = 6, number of rules used = 6, integrand size = 11, \(\frac{\text{number of rules}}{\text{integrand size}}\) = 0.546 \[ \frac{\log \left (-\sqrt [3]{1-a} \sqrt [3]{b} x+(1-a)^{2/3}+b^{2/3} x^2\right )}{6 (1-a)^{2/3} \sqrt [3]{b}}-\frac{\log \left (\sqrt [3]{1-a}+\sqrt [3]{b} x\right )}{3 (1-a)^{2/3} \sqrt [3]{b}}+\frac{\tan ^{-1}\left (\frac{1-\frac{2 \sqrt [3]{b} x}{\sqrt [3]{1-a}}}{\sqrt{3}}\right )}{\sqrt{3} (1-a)^{2/3} \sqrt [3]{b}} \]

Antiderivative was successfully verified.

[In]  Int[(-1 + a - b*x^3)^(-1),x]

[Out]

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

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Rubi in Sympy [A]  time = 28.645, size = 117, normalized size = 0.85 \[ - \frac{\log{\left (\sqrt [3]{b} x + \sqrt [3]{- a + 1} \right )}}{3 \sqrt [3]{b} \left (- a + 1\right )^{\frac{2}{3}}} + \frac{\log{\left (b^{\frac{2}{3}} x^{2} - \sqrt [3]{b} x \sqrt [3]{- a + 1} + \left (- a + 1\right )^{\frac{2}{3}} \right )}}{6 \sqrt [3]{b} \left (- a + 1\right )^{\frac{2}{3}}} + \frac{\sqrt{3} \operatorname{atan}{\left (\sqrt{3} \left (- \frac{2 \sqrt [3]{b} x}{3 \sqrt [3]{- a + 1}} + \frac{1}{3}\right ) \right )}}{3 \sqrt [3]{b} \left (- a + 1\right )^{\frac{2}{3}}} \]

Verification of antiderivative is not currently implemented for this CAS.

[In]  rubi_integrate(1/(-b*x**3+a-1),x)

[Out]

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

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Mathematica [A]  time = 0.103293, size = 124, normalized size = 0.9 \[ \frac{(-1)^{2/3} \left (\log \left (-\sqrt [3]{-1} \sqrt [3]{a-1} \sqrt [3]{b} x+(a-1)^{2/3}+(-1)^{2/3} b^{2/3} x^2\right )-2 \log \left (\sqrt [3]{a-1}+\sqrt [3]{-1} \sqrt [3]{b} x\right )-2 \sqrt{3} \tan ^{-1}\left (\frac{\frac{2 \sqrt [3]{-1} \sqrt [3]{b} x}{\sqrt [3]{a-1}}-1}{\sqrt{3}}\right )\right )}{6 (a-1)^{2/3} \sqrt [3]{b}} \]

Antiderivative was successfully verified.

[In]  Integrate[(-1 + a - b*x^3)^(-1),x]

[Out]

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

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Maple [A]  time = 0.006, size = 106, normalized size = 0.8 \[ -{\frac{1}{3\,b}\ln \left ( x-\sqrt [3]{{\frac{-1+a}{b}}} \right ) \left ({\frac{-1+a}{b}} \right ) ^{-{\frac{2}{3}}}}+{\frac{1}{6\,b}\ln \left ({x}^{2}+x\sqrt [3]{{\frac{-1+a}{b}}}+ \left ({\frac{-1+a}{b}} \right ) ^{{\frac{2}{3}}} \right ) \left ({\frac{-1+a}{b}} \right ) ^{-{\frac{2}{3}}}}+{\frac{\sqrt{3}}{3\,b}\arctan \left ({\frac{\sqrt{3}}{3} \left ( 2\,{x{\frac{1}{\sqrt [3]{{\frac{-1+a}{b}}}}}}+1 \right ) } \right ) \left ({\frac{-1+a}{b}} \right ) ^{-{\frac{2}{3}}}} \]

Verification of antiderivative is not currently implemented for this CAS.

[In]  int(1/(-b*x^3+a-1),x)

[Out]

-1/3/b/((-1+a)/b)^(2/3)*ln(x-((-1+a)/b)^(1/3))+1/6/b/((-1+a)/b)^(2/3)*ln(x^2+x*(
(-1+a)/b)^(1/3)+((-1+a)/b)^(2/3))+1/3/b/((-1+a)/b)^(2/3)*3^(1/2)*arctan(1/3*3^(1
/2)*(2/((-1+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 + 1),x, algorithm="maxima")

[Out]

Exception raised: ValueError

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Fricas [A]  time = 0.21829, size = 176, normalized size = 1.28 \[ -\frac{\sqrt{3}{\left (\sqrt{3} \log \left (\left (-{\left (a^{2} - 2 \, a + 1\right )} b\right )^{\frac{2}{3}} x^{2} - \left (-{\left (a^{2} - 2 \, a + 1\right )} b\right )^{\frac{1}{3}}{\left (a - 1\right )} x + a^{2} - 2 \, a + 1\right ) - 2 \, \sqrt{3} \log \left (\left (-{\left (a^{2} - 2 \, a + 1\right )} b\right )^{\frac{1}{3}} x + a - 1\right ) - 6 \, \arctan \left (\frac{2 \, \sqrt{3} \left (-{\left (a^{2} - 2 \, a + 1\right )} b\right )^{\frac{1}{3}} x - \sqrt{3}{\left (a - 1\right )}}{3 \,{\left (a - 1\right )}}\right )\right )}}{18 \, \left (-{\left (a^{2} - 2 \, a + 1\right )} b\right )^{\frac{1}{3}}} \]

Verification of antiderivative is not currently implemented for this CAS.

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

[Out]

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

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Sympy [A]  time = 0.736023, size = 34, normalized size = 0.25 \[ - \operatorname{RootSum}{\left (t^{3} \left (27 a^{2} b - 54 a b + 27 b\right ) - 1, \left ( t \mapsto t \log{\left (- 3 t a + 3 t + x \right )} \right )\right )} \]

Verification of antiderivative is not currently implemented for this CAS.

[In]  integrate(1/(-b*x**3+a-1),x)

[Out]

-RootSum(_t**3*(27*a**2*b - 54*a*b + 27*b) - 1, Lambda(_t, _t*log(-3*_t*a + 3*_t
+ x)))

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GIAC/XCAS [A]  time = 0.253216, size = 186, normalized size = 1.35 \[ \frac{{\left (a b^{2} - b^{2}\right )}^{\frac{1}{3}} \arctan \left (\frac{\sqrt{3}{\left (2 \, x + \left (\frac{a - 1}{b}\right )^{\frac{1}{3}}\right )}}{3 \, \left (\frac{a - 1}{b}\right )^{\frac{1}{3}}}\right )}{\sqrt{3} a b - \sqrt{3} b} + \frac{{\left (a b^{2} - b^{2}\right )}^{\frac{1}{3}}{\rm ln}\left (x^{2} + x \left (\frac{a - 1}{b}\right )^{\frac{1}{3}} + \left (\frac{a - 1}{b}\right )^{\frac{2}{3}}\right )}{6 \,{\left (a b - b\right )}} - \frac{\left (\frac{a - 1}{b}\right )^{\frac{1}{3}}{\rm ln}\left ({\left | x - \left (\frac{a - 1}{b}\right )^{\frac{1}{3}} \right |}\right )}{3 \,{\left (a - 1\right )}} \]

Verification of antiderivative is not currently implemented for this CAS.

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

[Out]

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