Optimal. Leaf size=85 \[ \frac {\left (3 b-17 a x^4\right ) \left (-b+a x^4\right )^{3/4}}{21 x^7}+a^{7/4} \text {ArcTan}\left (\frac {\sqrt [4]{a} x}{\sqrt [4]{-b+a x^4}}\right )+a^{7/4} \tanh ^{-1}\left (\frac {\sqrt [4]{a} x}{\sqrt [4]{-b+a x^4}}\right ) \]
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Rubi [A]
time = 0.03, antiderivative size = 96, normalized size of antiderivative = 1.13, number of steps
used = 6, number of rules used = 6, integrand size = 27, \(\frac {\text {number of rules}}{\text {integrand size}}\) = 0.222, Rules used = {462, 283, 246,
218, 212, 209} \begin {gather*} a^{7/4} \text {ArcTan}\left (\frac {\sqrt [4]{a} x}{\sqrt [4]{a x^4-b}}\right )+a^{7/4} \tanh ^{-1}\left (\frac {\sqrt [4]{a} x}{\sqrt [4]{a x^4-b}}\right )-\frac {\left (a x^4-b\right )^{7/4}}{7 x^7}-\frac {2 a \left (a x^4-b\right )^{3/4}}{3 x^3} \end {gather*}
Antiderivative was successfully verified.
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Rule 209
Rule 212
Rule 218
Rule 246
Rule 283
Rule 462
Rubi steps
\begin {align*} \int \frac {\left (-b+a x^4\right )^{3/4} \left (-b+2 a x^4\right )}{x^8} \, dx &=-\frac {\left (-b+a x^4\right )^{7/4}}{7 x^7}+(2 a) \int \frac {\left (-b+a x^4\right )^{3/4}}{x^4} \, dx\\ &=-\frac {2 a \left (-b+a x^4\right )^{3/4}}{3 x^3}-\frac {\left (-b+a x^4\right )^{7/4}}{7 x^7}+\left (2 a^2\right ) \int \frac {1}{\sqrt [4]{-b+a x^4}} \, dx\\ &=-\frac {2 a \left (-b+a x^4\right )^{3/4}}{3 x^3}-\frac {\left (-b+a x^4\right )^{7/4}}{7 x^7}+\left (2 a^2\right ) \text {Subst}\left (\int \frac {1}{1-a x^4} \, dx,x,\frac {x}{\sqrt [4]{-b+a x^4}}\right )\\ &=-\frac {2 a \left (-b+a x^4\right )^{3/4}}{3 x^3}-\frac {\left (-b+a x^4\right )^{7/4}}{7 x^7}+a^2 \text {Subst}\left (\int \frac {1}{1-\sqrt {a} x^2} \, dx,x,\frac {x}{\sqrt [4]{-b+a x^4}}\right )+a^2 \text {Subst}\left (\int \frac {1}{1+\sqrt {a} x^2} \, dx,x,\frac {x}{\sqrt [4]{-b+a x^4}}\right )\\ &=-\frac {2 a \left (-b+a x^4\right )^{3/4}}{3 x^3}-\frac {\left (-b+a x^4\right )^{7/4}}{7 x^7}+a^{7/4} \tan ^{-1}\left (\frac {\sqrt [4]{a} x}{\sqrt [4]{-b+a x^4}}\right )+a^{7/4} \tanh ^{-1}\left (\frac {\sqrt [4]{a} x}{\sqrt [4]{-b+a x^4}}\right )\\ \end {align*}
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Mathematica [A]
time = 0.21, size = 85, normalized size = 1.00 \begin {gather*} -\frac {\left (-b+a x^4\right )^{3/4} \left (-3 b+17 a x^4\right )}{21 x^7}+a^{7/4} \text {ArcTan}\left (\frac {\sqrt [4]{a} x}{\sqrt [4]{-b+a x^4}}\right )+a^{7/4} \tanh ^{-1}\left (\frac {\sqrt [4]{a} x}{\sqrt [4]{-b+a x^4}}\right ) \end {gather*}
Antiderivative was successfully verified.
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Maple [F]
time = 0.01, size = 0, normalized size = 0.00 \[\int \frac {\left (a \,x^{4}-b \right )^{\frac {3}{4}} \left (2 a \,x^{4}-b \right )}{x^{8}}\, dx\]
Verification of antiderivative is not currently implemented for this CAS.
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Maxima [A]
time = 0.46, size = 113, normalized size = 1.33 \begin {gather*} -\frac {1}{6} \, {\left (3 \, a {\left (\frac {2 \, \arctan \left (\frac {{\left (a x^{4} - b\right )}^{\frac {1}{4}}}{a^{\frac {1}{4}} x}\right )}{a^{\frac {1}{4}}} + \frac {\log \left (-\frac {a^{\frac {1}{4}} - \frac {{\left (a x^{4} - b\right )}^{\frac {1}{4}}}{x}}{a^{\frac {1}{4}} + \frac {{\left (a x^{4} - b\right )}^{\frac {1}{4}}}{x}}\right )}{a^{\frac {1}{4}}}\right )} + \frac {4 \, {\left (a x^{4} - b\right )}^{\frac {3}{4}}}{x^{3}}\right )} a - \frac {{\left (a x^{4} - b\right )}^{\frac {7}{4}}}{7 \, x^{7}} \end {gather*}
Verification of antiderivative is not currently implemented for this CAS.
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Fricas [F(-1)] Timed out
time = 0.00, size = 0, normalized size = 0.00 \begin {gather*} \text {Timed out} \end {gather*}
Verification of antiderivative is not currently implemented for this CAS.
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Sympy [C] Result contains complex when optimal does not.
time = 2.31, size = 209, normalized size = 2.46 \begin {gather*} \frac {a b^{\frac {3}{4}} e^{\frac {3 i \pi }{4}} \Gamma \left (- \frac {3}{4}\right ) {{}_{2}F_{1}\left (\begin {matrix} - \frac {3}{4}, - \frac {3}{4} \\ \frac {1}{4} \end {matrix}\middle | {\frac {a x^{4}}{b}} \right )}}{2 x^{3} \Gamma \left (\frac {1}{4}\right )} - b \left (\begin {cases} \frac {a^{\frac {7}{4}} \left (-1 + \frac {b}{a x^{4}}\right )^{\frac {3}{4}} e^{- \frac {i \pi }{4}} \Gamma \left (- \frac {7}{4}\right )}{4 b \Gamma \left (- \frac {3}{4}\right )} - \frac {a^{\frac {3}{4}} \left (-1 + \frac {b}{a x^{4}}\right )^{\frac {3}{4}} e^{- \frac {i \pi }{4}} \Gamma \left (- \frac {7}{4}\right )}{4 x^{4} \Gamma \left (- \frac {3}{4}\right )} & \text {for}\: \left |{\frac {b}{a x^{4}}}\right | > 1 \\- \frac {a^{\frac {7}{4}} \left (1 - \frac {b}{a x^{4}}\right )^{\frac {3}{4}} \Gamma \left (- \frac {7}{4}\right )}{4 b \Gamma \left (- \frac {3}{4}\right )} + \frac {a^{\frac {3}{4}} \left (1 - \frac {b}{a x^{4}}\right )^{\frac {3}{4}} \Gamma \left (- \frac {7}{4}\right )}{4 x^{4} \Gamma \left (- \frac {3}{4}\right )} & \text {otherwise} \end {cases}\right ) \end {gather*}
Verification of antiderivative is not currently implemented for this CAS.
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Giac [F]
time = 0.00, size = 0, normalized size = 0.00 \begin {gather*} \text {could not integrate} \end {gather*}
Verification of antiderivative is not currently implemented for this CAS.
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Mupad [F]
time = 0.00, size = -1, normalized size = -0.01 \begin {gather*} -\int \frac {{\left (a\,x^4-b\right )}^{3/4}\,\left (b-2\,a\,x^4\right )}{x^8} \,d x \end {gather*}
Verification of antiderivative is not currently implemented for this CAS.
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