Optimal. Leaf size=108 \[ \frac{2 b^{5/2} x^3 \left (1-\frac{a}{b x^4}\right )^{3/4} \text{EllipticF}\left (\frac{1}{2} \csc ^{-1}\left (\frac{\sqrt{b} x^2}{\sqrt{a}}\right ),2\right )}{21 a^{3/2} \left (a-b x^4\right )^{3/4}}+\frac{b \sqrt [4]{a-b x^4}}{21 a x^3}-\frac{\sqrt [4]{a-b x^4}}{7 x^7} \]
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Rubi [A] time = 0.0459606, antiderivative size = 108, normalized size of antiderivative = 1., number of steps used = 6, number of rules used = 6, integrand size = 16, \(\frac{\text{number of rules}}{\text{integrand size}}\) = 0.375, Rules used = {277, 325, 237, 335, 275, 232} \[ \frac{2 b^{5/2} x^3 \left (1-\frac{a}{b x^4}\right )^{3/4} F\left (\left .\frac{1}{2} \csc ^{-1}\left (\frac{\sqrt{b} x^2}{\sqrt{a}}\right )\right |2\right )}{21 a^{3/2} \left (a-b x^4\right )^{3/4}}+\frac{b \sqrt [4]{a-b x^4}}{21 a x^3}-\frac{\sqrt [4]{a-b x^4}}{7 x^7} \]
Antiderivative was successfully verified.
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Rule 277
Rule 325
Rule 237
Rule 335
Rule 275
Rule 232
Rubi steps
\begin{align*} \int \frac{\sqrt [4]{a-b x^4}}{x^8} \, dx &=-\frac{\sqrt [4]{a-b x^4}}{7 x^7}-\frac{1}{7} b \int \frac{1}{x^4 \left (a-b x^4\right )^{3/4}} \, dx\\ &=-\frac{\sqrt [4]{a-b x^4}}{7 x^7}+\frac{b \sqrt [4]{a-b x^4}}{21 a x^3}-\frac{\left (2 b^2\right ) \int \frac{1}{\left (a-b x^4\right )^{3/4}} \, dx}{21 a}\\ &=-\frac{\sqrt [4]{a-b x^4}}{7 x^7}+\frac{b \sqrt [4]{a-b x^4}}{21 a x^3}-\frac{\left (2 b^2 \left (1-\frac{a}{b x^4}\right )^{3/4} x^3\right ) \int \frac{1}{\left (1-\frac{a}{b x^4}\right )^{3/4} x^3} \, dx}{21 a \left (a-b x^4\right )^{3/4}}\\ &=-\frac{\sqrt [4]{a-b x^4}}{7 x^7}+\frac{b \sqrt [4]{a-b x^4}}{21 a x^3}+\frac{\left (2 b^2 \left (1-\frac{a}{b x^4}\right )^{3/4} x^3\right ) \operatorname{Subst}\left (\int \frac{x}{\left (1-\frac{a x^4}{b}\right )^{3/4}} \, dx,x,\frac{1}{x}\right )}{21 a \left (a-b x^4\right )^{3/4}}\\ &=-\frac{\sqrt [4]{a-b x^4}}{7 x^7}+\frac{b \sqrt [4]{a-b x^4}}{21 a x^3}+\frac{\left (b^2 \left (1-\frac{a}{b x^4}\right )^{3/4} x^3\right ) \operatorname{Subst}\left (\int \frac{1}{\left (1-\frac{a x^2}{b}\right )^{3/4}} \, dx,x,\frac{1}{x^2}\right )}{21 a \left (a-b x^4\right )^{3/4}}\\ &=-\frac{\sqrt [4]{a-b x^4}}{7 x^7}+\frac{b \sqrt [4]{a-b x^4}}{21 a x^3}+\frac{2 b^{5/2} \left (1-\frac{a}{b x^4}\right )^{3/4} x^3 F\left (\left .\frac{1}{2} \csc ^{-1}\left (\frac{\sqrt{b} x^2}{\sqrt{a}}\right )\right |2\right )}{21 a^{3/2} \left (a-b x^4\right )^{3/4}}\\ \end{align*}
Mathematica [C] time = 0.0095036, size = 52, normalized size = 0.48 \[ -\frac{\sqrt [4]{a-b x^4} \, _2F_1\left (-\frac{7}{4},-\frac{1}{4};-\frac{3}{4};\frac{b x^4}{a}\right )}{7 x^7 \sqrt [4]{1-\frac{b x^4}{a}}} \]
Antiderivative was successfully verified.
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Maple [F] time = 0.02, size = 0, normalized size = 0. \begin{align*} \int{\frac{1}{{x}^{8}}\sqrt [4]{-b{x}^{4}+a}}\, dx \end{align*}
Verification of antiderivative is not currently implemented for this CAS.
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Maxima [F] time = 0., size = 0, normalized size = 0. \begin{align*} \int \frac{{\left (-b x^{4} + a\right )}^{\frac{1}{4}}}{x^{8}}\,{d x} \end{align*}
Verification of antiderivative is not currently implemented for this CAS.
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Fricas [F] time = 0., size = 0, normalized size = 0. \begin{align*}{\rm integral}\left (\frac{{\left (-b x^{4} + a\right )}^{\frac{1}{4}}}{x^{8}}, x\right ) \end{align*}
Verification of antiderivative is not currently implemented for this CAS.
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Sympy [C] time = 1.89381, size = 34, normalized size = 0.31 \begin{align*} \frac{i \sqrt [4]{b} e^{\frac{3 i \pi }{4}}{{}_{2}F_{1}\left (\begin{matrix} - \frac{1}{4}, \frac{3}{2} \\ \frac{5}{2} \end{matrix}\middle |{\frac{a}{b x^{4}}} \right )}}{6 x^{6}} \end{align*}
Verification of antiderivative is not currently implemented for this CAS.
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Giac [F] time = 0., size = 0, normalized size = 0. \begin{align*} \int \frac{{\left (-b x^{4} + a\right )}^{\frac{1}{4}}}{x^{8}}\,{d x} \end{align*}
Verification of antiderivative is not currently implemented for this CAS.
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