Integrand size = 35, antiderivative size = 134 \[ \int \frac {\left (-4 b+a x^4\right ) \left (b+a x^4\right )^{3/4}}{x^8 \left (4 b+a x^4\right )} \, dx=\frac {\left (6 b-a x^4\right ) \left (b+a x^4\right )^{3/4}}{42 b x^7}+\frac {3^{3/4} a^{7/4} \arctan \left (\frac {\sqrt [4]{3} \sqrt [4]{a} x}{\sqrt {2} \sqrt [4]{b+a x^4}}\right )}{8 \sqrt {2} b}+\frac {3^{3/4} a^{7/4} \text {arctanh}\left (\frac {\sqrt [4]{3} \sqrt [4]{a} x}{\sqrt {2} \sqrt [4]{b+a x^4}}\right )}{8 \sqrt {2} b} \]
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Time = 0.12 (sec) , antiderivative size = 143, normalized size of antiderivative = 1.07, number of steps used = 7, number of rules used = 7, \(\frac {\text {number of rules}}{\text {integrand size}}\) = 0.200, Rules used = {594, 597, 12, 385, 218, 212, 209} \[ \int \frac {\left (-4 b+a x^4\right ) \left (b+a x^4\right )^{3/4}}{x^8 \left (4 b+a x^4\right )} \, dx=\frac {3^{3/4} a^{7/4} \arctan \left (\frac {\sqrt [4]{3} \sqrt [4]{a} x}{\sqrt {2} \sqrt [4]{a x^4+b}}\right )}{8 \sqrt {2} b}+\frac {3^{3/4} a^{7/4} \text {arctanh}\left (\frac {\sqrt [4]{3} \sqrt [4]{a} x}{\sqrt {2} \sqrt [4]{a x^4+b}}\right )}{8 \sqrt {2} b}+\frac {\left (a x^4+b\right )^{3/4}}{7 x^7}-\frac {a \left (a x^4+b\right )^{3/4}}{42 b x^3} \]
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Rule 12
Rule 209
Rule 212
Rule 218
Rule 385
Rule 594
Rule 597
Rubi steps \begin{align*} \text {integral}& = \frac {\left (b+a x^4\right )^{3/4}}{7 x^7}+\frac {\int \frac {8 a b^2+44 a^2 b x^4}{x^4 \sqrt [4]{b+a x^4} \left (4 b+a x^4\right )} \, dx}{28 b} \\ & = \frac {\left (b+a x^4\right )^{3/4}}{7 x^7}-\frac {a \left (b+a x^4\right )^{3/4}}{42 b x^3}-\frac {\int -\frac {504 a^2 b^3}{\sqrt [4]{b+a x^4} \left (4 b+a x^4\right )} \, dx}{336 b^3} \\ & = \frac {\left (b+a x^4\right )^{3/4}}{7 x^7}-\frac {a \left (b+a x^4\right )^{3/4}}{42 b x^3}+\frac {1}{2} \left (3 a^2\right ) \int \frac {1}{\sqrt [4]{b+a x^4} \left (4 b+a x^4\right )} \, dx \\ & = \frac {\left (b+a x^4\right )^{3/4}}{7 x^7}-\frac {a \left (b+a x^4\right )^{3/4}}{42 b x^3}+\frac {1}{2} \left (3 a^2\right ) \text {Subst}\left (\int \frac {1}{4 b-3 a b x^4} \, dx,x,\frac {x}{\sqrt [4]{b+a x^4}}\right ) \\ & = \frac {\left (b+a x^4\right )^{3/4}}{7 x^7}-\frac {a \left (b+a x^4\right )^{3/4}}{42 b x^3}+\frac {\left (3 a^2\right ) \text {Subst}\left (\int \frac {1}{2-\sqrt {3} \sqrt {a} x^2} \, dx,x,\frac {x}{\sqrt [4]{b+a x^4}}\right )}{8 b}+\frac {\left (3 a^2\right ) \text {Subst}\left (\int \frac {1}{2+\sqrt {3} \sqrt {a} x^2} \, dx,x,\frac {x}{\sqrt [4]{b+a x^4}}\right )}{8 b} \\ & = \frac {\left (b+a x^4\right )^{3/4}}{7 x^7}-\frac {a \left (b+a x^4\right )^{3/4}}{42 b x^3}+\frac {3^{3/4} a^{7/4} \arctan \left (\frac {\sqrt [4]{3} \sqrt [4]{a} x}{\sqrt {2} \sqrt [4]{b+a x^4}}\right )}{8 \sqrt {2} b}+\frac {3^{3/4} a^{7/4} \text {arctanh}\left (\frac {\sqrt [4]{3} \sqrt [4]{a} x}{\sqrt {2} \sqrt [4]{b+a x^4}}\right )}{8 \sqrt {2} b} \\ \end{align*}
Time = 0.63 (sec) , antiderivative size = 134, normalized size of antiderivative = 1.00 \[ \int \frac {\left (-4 b+a x^4\right ) \left (b+a x^4\right )^{3/4}}{x^8 \left (4 b+a x^4\right )} \, dx=\frac {\left (6 b-a x^4\right ) \left (b+a x^4\right )^{3/4}}{42 b x^7}+\frac {3^{3/4} a^{7/4} \arctan \left (\frac {\sqrt [4]{3} \sqrt [4]{a} x}{\sqrt {2} \sqrt [4]{b+a x^4}}\right )}{8 \sqrt {2} b}+\frac {3^{3/4} a^{7/4} \text {arctanh}\left (\frac {\sqrt [4]{3} \sqrt [4]{a} x}{\sqrt {2} \sqrt [4]{b+a x^4}}\right )}{8 \sqrt {2} b} \]
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Time = 0.69 (sec) , antiderivative size = 151, normalized size of antiderivative = 1.13
method | result | size |
pseudoelliptic | \(-\frac {\left (126 \arctan \left (\frac {3^{\frac {3}{4}} \sqrt {2}\, \left (a \,x^{4}+b \right )^{\frac {1}{4}}}{3 a^{\frac {1}{4}} x}\right ) a^{2} \sqrt {2}\, x^{7}-63 \ln \left (\frac {\sqrt {2}\, 3^{\frac {1}{4}} a^{\frac {1}{4}} x +2 \left (a \,x^{4}+b \right )^{\frac {1}{4}}}{-\sqrt {2}\, 3^{\frac {1}{4}} a^{\frac {1}{4}} x +2 \left (a \,x^{4}+b \right )^{\frac {1}{4}}}\right ) a^{2} \sqrt {2}\, x^{7}+16 a^{\frac {5}{4}} \left (a \,x^{4}+b \right )^{\frac {3}{4}} x^{4} 3^{\frac {1}{4}}-96 b \left (a \,x^{4}+b \right )^{\frac {3}{4}} 3^{\frac {1}{4}} a^{\frac {1}{4}}\right ) 3^{\frac {3}{4}}}{2016 x^{7} a^{\frac {1}{4}} b}\) | \(151\) |
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Result contains complex when optimal does not.
Time = 55.91 (sec) , antiderivative size = 593, normalized size of antiderivative = 4.43 \[ \int \frac {\left (-4 b+a x^4\right ) \left (b+a x^4\right )^{3/4}}{x^8 \left (4 b+a x^4\right )} \, dx=\frac {21 \, \left (\frac {27}{4}\right )^{\frac {1}{4}} \left (\frac {a^{7}}{b^{4}}\right )^{\frac {1}{4}} b x^{7} \log \left (\frac {18 \, \sqrt {3} {\left (a x^{4} + b\right )}^{\frac {1}{4}} \sqrt {\frac {a^{7}}{b^{4}}} a^{2} b^{2} x^{3} + 8 \, \left (\frac {27}{4}\right )^{\frac {3}{4}} \sqrt {a x^{4} + b} \left (\frac {a^{7}}{b^{4}}\right )^{\frac {3}{4}} b^{3} x^{2} + 36 \, {\left (a x^{4} + b\right )}^{\frac {3}{4}} a^{5} x + 3 \, \left (\frac {27}{4}\right )^{\frac {1}{4}} {\left (7 \, a^{4} b x^{4} + 4 \, a^{3} b^{2}\right )} \left (\frac {a^{7}}{b^{4}}\right )^{\frac {1}{4}}}{4 \, {\left (a x^{4} + 4 \, b\right )}}\right ) + 21 i \, \left (\frac {27}{4}\right )^{\frac {1}{4}} \left (\frac {a^{7}}{b^{4}}\right )^{\frac {1}{4}} b x^{7} \log \left (-\frac {18 \, \sqrt {3} {\left (a x^{4} + b\right )}^{\frac {1}{4}} \sqrt {\frac {a^{7}}{b^{4}}} a^{2} b^{2} x^{3} + 8 i \, \left (\frac {27}{4}\right )^{\frac {3}{4}} \sqrt {a x^{4} + b} \left (\frac {a^{7}}{b^{4}}\right )^{\frac {3}{4}} b^{3} x^{2} - 36 \, {\left (a x^{4} + b\right )}^{\frac {3}{4}} a^{5} x + 3 \, \left (\frac {27}{4}\right )^{\frac {1}{4}} {\left (-7 i \, a^{4} b x^{4} - 4 i \, a^{3} b^{2}\right )} \left (\frac {a^{7}}{b^{4}}\right )^{\frac {1}{4}}}{4 \, {\left (a x^{4} + 4 \, b\right )}}\right ) - 21 i \, \left (\frac {27}{4}\right )^{\frac {1}{4}} \left (\frac {a^{7}}{b^{4}}\right )^{\frac {1}{4}} b x^{7} \log \left (-\frac {18 \, \sqrt {3} {\left (a x^{4} + b\right )}^{\frac {1}{4}} \sqrt {\frac {a^{7}}{b^{4}}} a^{2} b^{2} x^{3} - 8 i \, \left (\frac {27}{4}\right )^{\frac {3}{4}} \sqrt {a x^{4} + b} \left (\frac {a^{7}}{b^{4}}\right )^{\frac {3}{4}} b^{3} x^{2} - 36 \, {\left (a x^{4} + b\right )}^{\frac {3}{4}} a^{5} x + 3 \, \left (\frac {27}{4}\right )^{\frac {1}{4}} {\left (7 i \, a^{4} b x^{4} + 4 i \, a^{3} b^{2}\right )} \left (\frac {a^{7}}{b^{4}}\right )^{\frac {1}{4}}}{4 \, {\left (a x^{4} + 4 \, b\right )}}\right ) - 21 \, \left (\frac {27}{4}\right )^{\frac {1}{4}} \left (\frac {a^{7}}{b^{4}}\right )^{\frac {1}{4}} b x^{7} \log \left (\frac {18 \, \sqrt {3} {\left (a x^{4} + b\right )}^{\frac {1}{4}} \sqrt {\frac {a^{7}}{b^{4}}} a^{2} b^{2} x^{3} - 8 \, \left (\frac {27}{4}\right )^{\frac {3}{4}} \sqrt {a x^{4} + b} \left (\frac {a^{7}}{b^{4}}\right )^{\frac {3}{4}} b^{3} x^{2} + 36 \, {\left (a x^{4} + b\right )}^{\frac {3}{4}} a^{5} x - 3 \, \left (\frac {27}{4}\right )^{\frac {1}{4}} {\left (7 \, a^{4} b x^{4} + 4 \, a^{3} b^{2}\right )} \left (\frac {a^{7}}{b^{4}}\right )^{\frac {1}{4}}}{4 \, {\left (a x^{4} + 4 \, b\right )}}\right ) - 16 \, {\left (a x^{4} + b\right )}^{\frac {3}{4}} {\left (a x^{4} - 6 \, b\right )}}{672 \, b x^{7}} \]
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\[ \int \frac {\left (-4 b+a x^4\right ) \left (b+a x^4\right )^{3/4}}{x^8 \left (4 b+a x^4\right )} \, dx=\int \frac {\left (a x^{4} - 4 b\right ) \left (a x^{4} + b\right )^{\frac {3}{4}}}{x^{8} \left (a x^{4} + 4 b\right )}\, dx \]
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\[ \int \frac {\left (-4 b+a x^4\right ) \left (b+a x^4\right )^{3/4}}{x^8 \left (4 b+a x^4\right )} \, dx=\int { \frac {{\left (a x^{4} + b\right )}^{\frac {3}{4}} {\left (a x^{4} - 4 \, b\right )}}{{\left (a x^{4} + 4 \, b\right )} x^{8}} \,d x } \]
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\[ \int \frac {\left (-4 b+a x^4\right ) \left (b+a x^4\right )^{3/4}}{x^8 \left (4 b+a x^4\right )} \, dx=\int { \frac {{\left (a x^{4} + b\right )}^{\frac {3}{4}} {\left (a x^{4} - 4 \, b\right )}}{{\left (a x^{4} + 4 \, b\right )} x^{8}} \,d x } \]
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Timed out. \[ \int \frac {\left (-4 b+a x^4\right ) \left (b+a x^4\right )^{3/4}}{x^8 \left (4 b+a x^4\right )} \, dx=\int -\frac {{\left (a\,x^4+b\right )}^{3/4}\,\left (4\,b-a\,x^4\right )}{x^8\,\left (a\,x^4+4\,b\right )} \,d x \]
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