Optimal. Leaf size=268 \[ -\frac {3 i x^2 \text {Li}_2\left (-\frac {i \sqrt {a} f^x}{\sqrt {b}}\right )}{2 \sqrt {a} \sqrt {b} \log ^2(f)}+\frac {3 i x^2 \text {Li}_2\left (\frac {i \sqrt {a} f^x}{\sqrt {b}}\right )}{2 \sqrt {a} \sqrt {b} \log ^2(f)}-\frac {3 i \text {Li}_4\left (-\frac {i \sqrt {a} f^x}{\sqrt {b}}\right )}{\sqrt {a} \sqrt {b} \log ^4(f)}+\frac {3 i \text {Li}_4\left (\frac {i \sqrt {a} f^x}{\sqrt {b}}\right )}{\sqrt {a} \sqrt {b} \log ^4(f)}+\frac {3 i x \text {Li}_3\left (-\frac {i \sqrt {a} f^x}{\sqrt {b}}\right )}{\sqrt {a} \sqrt {b} \log ^3(f)}-\frac {3 i x \text {Li}_3\left (\frac {i \sqrt {a} f^x}{\sqrt {b}}\right )}{\sqrt {a} \sqrt {b} \log ^3(f)}+\frac {x^3 \tan ^{-1}\left (\frac {\sqrt {a} f^x}{\sqrt {b}}\right )}{\sqrt {a} \sqrt {b} \log (f)} \]
[Out]
________________________________________________________________________________________
Rubi [A] time = 0.22, antiderivative size = 268, normalized size of antiderivative = 1.00, number of steps used = 11, number of rules used = 8, integrand size = 19, \(\frac {\text {number of rules}}{\text {integrand size}}\) = 0.421, Rules used = {2282, 205, 2266, 12, 5143, 2531, 6609, 6589} \[ -\frac {3 i x^2 \text {PolyLog}\left (2,-\frac {i \sqrt {a} f^x}{\sqrt {b}}\right )}{2 \sqrt {a} \sqrt {b} \log ^2(f)}+\frac {3 i x^2 \text {PolyLog}\left (2,\frac {i \sqrt {a} f^x}{\sqrt {b}}\right )}{2 \sqrt {a} \sqrt {b} \log ^2(f)}+\frac {3 i x \text {PolyLog}\left (3,-\frac {i \sqrt {a} f^x}{\sqrt {b}}\right )}{\sqrt {a} \sqrt {b} \log ^3(f)}-\frac {3 i x \text {PolyLog}\left (3,\frac {i \sqrt {a} f^x}{\sqrt {b}}\right )}{\sqrt {a} \sqrt {b} \log ^3(f)}-\frac {3 i \text {PolyLog}\left (4,-\frac {i \sqrt {a} f^x}{\sqrt {b}}\right )}{\sqrt {a} \sqrt {b} \log ^4(f)}+\frac {3 i \text {PolyLog}\left (4,\frac {i \sqrt {a} f^x}{\sqrt {b}}\right )}{\sqrt {a} \sqrt {b} \log ^4(f)}+\frac {x^3 \tan ^{-1}\left (\frac {\sqrt {a} f^x}{\sqrt {b}}\right )}{\sqrt {a} \sqrt {b} \log (f)} \]
Antiderivative was successfully verified.
[In]
[Out]
Rule 12
Rule 205
Rule 2266
Rule 2282
Rule 2531
Rule 5143
Rule 6589
Rule 6609
Rubi steps
\begin {align*} \int \frac {x^3}{b f^{-x}+a f^x} \, dx &=\frac {x^3 \tan ^{-1}\left (\frac {\sqrt {a} f^x}{\sqrt {b}}\right )}{\sqrt {a} \sqrt {b} \log (f)}-3 \int \frac {x^2 \tan ^{-1}\left (\frac {\sqrt {a} f^x}{\sqrt {b}}\right )}{\sqrt {a} \sqrt {b} \log (f)} \, dx\\ &=\frac {x^3 \tan ^{-1}\left (\frac {\sqrt {a} f^x}{\sqrt {b}}\right )}{\sqrt {a} \sqrt {b} \log (f)}-\frac {3 \int x^2 \tan ^{-1}\left (\frac {\sqrt {a} f^x}{\sqrt {b}}\right ) \, dx}{\sqrt {a} \sqrt {b} \log (f)}\\ &=\frac {x^3 \tan ^{-1}\left (\frac {\sqrt {a} f^x}{\sqrt {b}}\right )}{\sqrt {a} \sqrt {b} \log (f)}-\frac {(3 i) \int x^2 \log \left (1-\frac {i \sqrt {a} f^x}{\sqrt {b}}\right ) \, dx}{2 \sqrt {a} \sqrt {b} \log (f)}+\frac {(3 i) \int x^2 \log \left (1+\frac {i \sqrt {a} f^x}{\sqrt {b}}\right ) \, dx}{2 \sqrt {a} \sqrt {b} \log (f)}\\ &=\frac {x^3 \tan ^{-1}\left (\frac {\sqrt {a} f^x}{\sqrt {b}}\right )}{\sqrt {a} \sqrt {b} \log (f)}-\frac {3 i x^2 \text {Li}_2\left (-\frac {i \sqrt {a} f^x}{\sqrt {b}}\right )}{2 \sqrt {a} \sqrt {b} \log ^2(f)}+\frac {3 i x^2 \text {Li}_2\left (\frac {i \sqrt {a} f^x}{\sqrt {b}}\right )}{2 \sqrt {a} \sqrt {b} \log ^2(f)}+\frac {(3 i) \int x \text {Li}_2\left (-\frac {i \sqrt {a} f^x}{\sqrt {b}}\right ) \, dx}{\sqrt {a} \sqrt {b} \log ^2(f)}-\frac {(3 i) \int x \text {Li}_2\left (\frac {i \sqrt {a} f^x}{\sqrt {b}}\right ) \, dx}{\sqrt {a} \sqrt {b} \log ^2(f)}\\ &=\frac {x^3 \tan ^{-1}\left (\frac {\sqrt {a} f^x}{\sqrt {b}}\right )}{\sqrt {a} \sqrt {b} \log (f)}-\frac {3 i x^2 \text {Li}_2\left (-\frac {i \sqrt {a} f^x}{\sqrt {b}}\right )}{2 \sqrt {a} \sqrt {b} \log ^2(f)}+\frac {3 i x^2 \text {Li}_2\left (\frac {i \sqrt {a} f^x}{\sqrt {b}}\right )}{2 \sqrt {a} \sqrt {b} \log ^2(f)}+\frac {3 i x \text {Li}_3\left (-\frac {i \sqrt {a} f^x}{\sqrt {b}}\right )}{\sqrt {a} \sqrt {b} \log ^3(f)}-\frac {3 i x \text {Li}_3\left (\frac {i \sqrt {a} f^x}{\sqrt {b}}\right )}{\sqrt {a} \sqrt {b} \log ^3(f)}-\frac {(3 i) \int \text {Li}_3\left (-\frac {i \sqrt {a} f^x}{\sqrt {b}}\right ) \, dx}{\sqrt {a} \sqrt {b} \log ^3(f)}+\frac {(3 i) \int \text {Li}_3\left (\frac {i \sqrt {a} f^x}{\sqrt {b}}\right ) \, dx}{\sqrt {a} \sqrt {b} \log ^3(f)}\\ &=\frac {x^3 \tan ^{-1}\left (\frac {\sqrt {a} f^x}{\sqrt {b}}\right )}{\sqrt {a} \sqrt {b} \log (f)}-\frac {3 i x^2 \text {Li}_2\left (-\frac {i \sqrt {a} f^x}{\sqrt {b}}\right )}{2 \sqrt {a} \sqrt {b} \log ^2(f)}+\frac {3 i x^2 \text {Li}_2\left (\frac {i \sqrt {a} f^x}{\sqrt {b}}\right )}{2 \sqrt {a} \sqrt {b} \log ^2(f)}+\frac {3 i x \text {Li}_3\left (-\frac {i \sqrt {a} f^x}{\sqrt {b}}\right )}{\sqrt {a} \sqrt {b} \log ^3(f)}-\frac {3 i x \text {Li}_3\left (\frac {i \sqrt {a} f^x}{\sqrt {b}}\right )}{\sqrt {a} \sqrt {b} \log ^3(f)}-\frac {(3 i) \operatorname {Subst}\left (\int \frac {\text {Li}_3\left (-\frac {i \sqrt {a} x}{\sqrt {b}}\right )}{x} \, dx,x,f^x\right )}{\sqrt {a} \sqrt {b} \log ^4(f)}+\frac {(3 i) \operatorname {Subst}\left (\int \frac {\text {Li}_3\left (\frac {i \sqrt {a} x}{\sqrt {b}}\right )}{x} \, dx,x,f^x\right )}{\sqrt {a} \sqrt {b} \log ^4(f)}\\ &=\frac {x^3 \tan ^{-1}\left (\frac {\sqrt {a} f^x}{\sqrt {b}}\right )}{\sqrt {a} \sqrt {b} \log (f)}-\frac {3 i x^2 \text {Li}_2\left (-\frac {i \sqrt {a} f^x}{\sqrt {b}}\right )}{2 \sqrt {a} \sqrt {b} \log ^2(f)}+\frac {3 i x^2 \text {Li}_2\left (\frac {i \sqrt {a} f^x}{\sqrt {b}}\right )}{2 \sqrt {a} \sqrt {b} \log ^2(f)}+\frac {3 i x \text {Li}_3\left (-\frac {i \sqrt {a} f^x}{\sqrt {b}}\right )}{\sqrt {a} \sqrt {b} \log ^3(f)}-\frac {3 i x \text {Li}_3\left (\frac {i \sqrt {a} f^x}{\sqrt {b}}\right )}{\sqrt {a} \sqrt {b} \log ^3(f)}-\frac {3 i \text {Li}_4\left (-\frac {i \sqrt {a} f^x}{\sqrt {b}}\right )}{\sqrt {a} \sqrt {b} \log ^4(f)}+\frac {3 i \text {Li}_4\left (\frac {i \sqrt {a} f^x}{\sqrt {b}}\right )}{\sqrt {a} \sqrt {b} \log ^4(f)}\\ \end {align*}
________________________________________________________________________________________
Mathematica [A] time = 0.05, size = 224, normalized size = 0.84 \[ \frac {i \left (-3 x^2 \log ^2(f) \text {Li}_2\left (-\frac {i \sqrt {a} f^x}{\sqrt {b}}\right )+3 x^2 \log ^2(f) \text {Li}_2\left (\frac {i \sqrt {a} f^x}{\sqrt {b}}\right )-6 \text {Li}_4\left (-\frac {i \sqrt {a} f^x}{\sqrt {b}}\right )+6 \text {Li}_4\left (\frac {i \sqrt {a} f^x}{\sqrt {b}}\right )+6 x \log (f) \text {Li}_3\left (-\frac {i \sqrt {a} f^x}{\sqrt {b}}\right )-6 x \log (f) \text {Li}_3\left (\frac {i \sqrt {a} f^x}{\sqrt {b}}\right )+x^3 \log ^3(f) \log \left (1-\frac {i \sqrt {a} f^x}{\sqrt {b}}\right )-x^3 \log ^3(f) \log \left (1+\frac {i \sqrt {a} f^x}{\sqrt {b}}\right )\right )}{2 \sqrt {a} \sqrt {b} \log ^4(f)} \]
Antiderivative was successfully verified.
[In]
[Out]
________________________________________________________________________________________
fricas [C] time = 0.43, size = 239, normalized size = 0.89 \[ -\frac {x^{3} \sqrt {-\frac {a}{b}} \log \left (f^{x} \sqrt {-\frac {a}{b}} + 1\right ) \log \relax (f)^{3} - x^{3} \sqrt {-\frac {a}{b}} \log \left (-f^{x} \sqrt {-\frac {a}{b}} + 1\right ) \log \relax (f)^{3} - 3 \, x^{2} \sqrt {-\frac {a}{b}} {\rm Li}_2\left (f^{x} \sqrt {-\frac {a}{b}}\right ) \log \relax (f)^{2} + 3 \, x^{2} \sqrt {-\frac {a}{b}} {\rm Li}_2\left (-f^{x} \sqrt {-\frac {a}{b}}\right ) \log \relax (f)^{2} + 6 \, x \sqrt {-\frac {a}{b}} \log \relax (f) {\rm polylog}\left (3, f^{x} \sqrt {-\frac {a}{b}}\right ) - 6 \, x \sqrt {-\frac {a}{b}} \log \relax (f) {\rm polylog}\left (3, -f^{x} \sqrt {-\frac {a}{b}}\right ) - 6 \, \sqrt {-\frac {a}{b}} {\rm polylog}\left (4, f^{x} \sqrt {-\frac {a}{b}}\right ) + 6 \, \sqrt {-\frac {a}{b}} {\rm polylog}\left (4, -f^{x} \sqrt {-\frac {a}{b}}\right )}{2 \, a \log \relax (f)^{4}} \]
Verification of antiderivative is not currently implemented for this CAS.
[In]
[Out]
________________________________________________________________________________________
giac [F] time = 0.00, size = 0, normalized size = 0.00 \[ \int \frac {x^{3}}{a f^{x} + \frac {b}{f^{x}}}\,{d x} \]
Verification of antiderivative is not currently implemented for this CAS.
[In]
[Out]
________________________________________________________________________________________
maple [F] time = 0.05, size = 0, normalized size = 0.00 \[ \int \frac {x^{3}}{a \,f^{x}+b \,f^{-x}}\, dx \]
Verification of antiderivative is not currently implemented for this CAS.
[In]
[Out]
________________________________________________________________________________________
maxima [F] time = 0.00, size = 0, normalized size = 0.00 \[ \int \frac {x^{3}}{a f^{x} + \frac {b}{f^{x}}}\,{d x} \]
Verification of antiderivative is not currently implemented for this CAS.
[In]
[Out]
________________________________________________________________________________________
mupad [F] time = 0.00, size = -1, normalized size = -0.00 \[ \int \frac {x^3}{\frac {b}{f^x}+a\,f^x} \,d x \]
Verification of antiderivative is not currently implemented for this CAS.
[In]
[Out]
________________________________________________________________________________________
sympy [F] time = 0.00, size = 0, normalized size = 0.00 \[ \int \frac {f^{x} x^{3}}{a f^{2 x} + b}\, dx \]
Verification of antiderivative is not currently implemented for this CAS.
[In]
[Out]
________________________________________________________________________________________