Integrand size = 16, antiderivative size = 108 \[ \int \frac {1}{x^7 \left (a-b x^4\right )^{3/4}} \, dx=-\frac {\sqrt [4]{a-b x^4}}{6 a x^6}-\frac {5 b \sqrt [4]{a-b x^4}}{12 a^2 x^2}+\frac {5 b^{3/2} \left (1-\frac {b x^4}{a}\right )^{3/4} \operatorname {EllipticF}\left (\frac {1}{2} \arcsin \left (\frac {\sqrt {b} x^2}{\sqrt {a}}\right ),2\right )}{12 a^{3/2} \left (a-b x^4\right )^{3/4}} \]
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Time = 0.05 (sec) , antiderivative size = 108, normalized size of antiderivative = 1.00, number of steps used = 5, number of rules used = 4, \(\frac {\text {number of rules}}{\text {integrand size}}\) = 0.250, Rules used = {281, 331, 239, 238} \[ \int \frac {1}{x^7 \left (a-b x^4\right )^{3/4}} \, dx=\frac {5 b^{3/2} \left (1-\frac {b x^4}{a}\right )^{3/4} \operatorname {EllipticF}\left (\frac {1}{2} \arcsin \left (\frac {\sqrt {b} x^2}{\sqrt {a}}\right ),2\right )}{12 a^{3/2} \left (a-b x^4\right )^{3/4}}-\frac {5 b \sqrt [4]{a-b x^4}}{12 a^2 x^2}-\frac {\sqrt [4]{a-b x^4}}{6 a x^6} \]
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Rule 238
Rule 239
Rule 281
Rule 331
Rubi steps \begin{align*} \text {integral}& = \frac {1}{2} \text {Subst}\left (\int \frac {1}{x^4 \left (a-b x^2\right )^{3/4}} \, dx,x,x^2\right ) \\ & = -\frac {\sqrt [4]{a-b x^4}}{6 a x^6}+\frac {(5 b) \text {Subst}\left (\int \frac {1}{x^2 \left (a-b x^2\right )^{3/4}} \, dx,x,x^2\right )}{12 a} \\ & = -\frac {\sqrt [4]{a-b x^4}}{6 a x^6}-\frac {5 b \sqrt [4]{a-b x^4}}{12 a^2 x^2}+\frac {\left (5 b^2\right ) \text {Subst}\left (\int \frac {1}{\left (a-b x^2\right )^{3/4}} \, dx,x,x^2\right )}{24 a^2} \\ & = -\frac {\sqrt [4]{a-b x^4}}{6 a x^6}-\frac {5 b \sqrt [4]{a-b x^4}}{12 a^2 x^2}+\frac {\left (5 b^2 \left (1-\frac {b x^4}{a}\right )^{3/4}\right ) \text {Subst}\left (\int \frac {1}{\left (1-\frac {b x^2}{a}\right )^{3/4}} \, dx,x,x^2\right )}{24 a^2 \left (a-b x^4\right )^{3/4}} \\ & = -\frac {\sqrt [4]{a-b x^4}}{6 a x^6}-\frac {5 b \sqrt [4]{a-b x^4}}{12 a^2 x^2}+\frac {5 b^{3/2} \left (1-\frac {b x^4}{a}\right )^{3/4} F\left (\left .\frac {1}{2} \sin ^{-1}\left (\frac {\sqrt {b} x^2}{\sqrt {a}}\right )\right |2\right )}{12 a^{3/2} \left (a-b x^4\right )^{3/4}} \\ \end{align*}
Result contains higher order function than in optimal. Order 5 vs. order 4 in optimal.
Time = 10.02 (sec) , antiderivative size = 52, normalized size of antiderivative = 0.48 \[ \int \frac {1}{x^7 \left (a-b x^4\right )^{3/4}} \, dx=-\frac {\left (1-\frac {b x^4}{a}\right )^{3/4} \operatorname {Hypergeometric2F1}\left (-\frac {3}{2},\frac {3}{4},-\frac {1}{2},\frac {b x^4}{a}\right )}{6 x^6 \left (a-b x^4\right )^{3/4}} \]
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\[\int \frac {1}{x^{7} \left (-b \,x^{4}+a \right )^{\frac {3}{4}}}d x\]
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\[ \int \frac {1}{x^7 \left (a-b x^4\right )^{3/4}} \, dx=\int { \frac {1}{{\left (-b x^{4} + a\right )}^{\frac {3}{4}} x^{7}} \,d x } \]
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Result contains complex when optimal does not.
Time = 0.69 (sec) , antiderivative size = 34, normalized size of antiderivative = 0.31 \[ \int \frac {1}{x^7 \left (a-b x^4\right )^{3/4}} \, dx=- \frac {{{}_{2}F_{1}\left (\begin {matrix} - \frac {3}{2}, \frac {3}{4} \\ - \frac {1}{2} \end {matrix}\middle | {\frac {b x^{4} e^{2 i \pi }}{a}} \right )}}{6 a^{\frac {3}{4}} x^{6}} \]
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\[ \int \frac {1}{x^7 \left (a-b x^4\right )^{3/4}} \, dx=\int { \frac {1}{{\left (-b x^{4} + a\right )}^{\frac {3}{4}} x^{7}} \,d x } \]
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\[ \int \frac {1}{x^7 \left (a-b x^4\right )^{3/4}} \, dx=\int { \frac {1}{{\left (-b x^{4} + a\right )}^{\frac {3}{4}} x^{7}} \,d x } \]
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Timed out. \[ \int \frac {1}{x^7 \left (a-b x^4\right )^{3/4}} \, dx=\int \frac {1}{x^7\,{\left (a-b\,x^4\right )}^{3/4}} \,d x \]
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