Integrand size = 19, antiderivative size = 160 \[ \int \frac {x^{-1-\frac {2 n}{3}}}{a+b x^n} \, dx=-\frac {3 x^{-2 n/3}}{2 a n}+\frac {\sqrt {3} b^{2/3} \arctan \left (\frac {\sqrt [3]{a}-2 \sqrt [3]{b} x^{n/3}}{\sqrt {3} \sqrt [3]{a}}\right )}{a^{5/3} n}-\frac {b^{2/3} \log \left (\sqrt [3]{a}+\sqrt [3]{b} x^{n/3}\right )}{a^{5/3} n}+\frac {b^{2/3} \log \left (a^{2/3}-\sqrt [3]{a} \sqrt [3]{b} x^{n/3}+b^{2/3} x^{2 n/3}\right )}{2 a^{5/3} n} \]
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Time = 0.08 (sec) , antiderivative size = 160, normalized size of antiderivative = 1.00, number of steps used = 8, number of rules used = 8, \(\frac {\text {number of rules}}{\text {integrand size}}\) = 0.421, Rules used = {369, 352, 206, 31, 648, 631, 210, 642} \[ \int \frac {x^{-1-\frac {2 n}{3}}}{a+b x^n} \, dx=\frac {\sqrt {3} b^{2/3} \arctan \left (\frac {\sqrt [3]{a}-2 \sqrt [3]{b} x^{n/3}}{\sqrt {3} \sqrt [3]{a}}\right )}{a^{5/3} n}-\frac {b^{2/3} \log \left (\sqrt [3]{a}+\sqrt [3]{b} x^{n/3}\right )}{a^{5/3} n}+\frac {b^{2/3} \log \left (a^{2/3}-\sqrt [3]{a} \sqrt [3]{b} x^{n/3}+b^{2/3} x^{2 n/3}\right )}{2 a^{5/3} n}-\frac {3 x^{-2 n/3}}{2 a n} \]
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Rule 31
Rule 206
Rule 210
Rule 352
Rule 369
Rule 631
Rule 642
Rule 648
Rubi steps \begin{align*} \text {integral}& = -\frac {3 x^{-2 n/3}}{2 a n}-\frac {b \int \frac {x^{\frac {1}{3} (-3+n)}}{a+b x^n} \, dx}{a} \\ & = -\frac {3 x^{-2 n/3}}{2 a n}-\frac {(3 b) \text {Subst}\left (\int \frac {1}{a+b x^3} \, dx,x,x^{1+\frac {1}{3} (-3+n)}\right )}{a n} \\ & = -\frac {3 x^{-2 n/3}}{2 a n}-\frac {b \text {Subst}\left (\int \frac {1}{\sqrt [3]{a}+\sqrt [3]{b} x} \, dx,x,x^{1+\frac {1}{3} (-3+n)}\right )}{a^{5/3} n}-\frac {b \text {Subst}\left (\int \frac {2 \sqrt [3]{a}-\sqrt [3]{b} x}{a^{2/3}-\sqrt [3]{a} \sqrt [3]{b} x+b^{2/3} x^2} \, dx,x,x^{1+\frac {1}{3} (-3+n)}\right )}{a^{5/3} n} \\ & = -\frac {3 x^{-2 n/3}}{2 a n}-\frac {b^{2/3} \log \left (\sqrt [3]{a}+\sqrt [3]{b} x^{n/3}\right )}{a^{5/3} n}+\frac {b^{2/3} \text {Subst}\left (\int \frac {-\sqrt [3]{a} \sqrt [3]{b}+2 b^{2/3} x}{a^{2/3}-\sqrt [3]{a} \sqrt [3]{b} x+b^{2/3} x^2} \, dx,x,x^{1+\frac {1}{3} (-3+n)}\right )}{2 a^{5/3} n}-\frac {(3 b) \text {Subst}\left (\int \frac {1}{a^{2/3}-\sqrt [3]{a} \sqrt [3]{b} x+b^{2/3} x^2} \, dx,x,x^{1+\frac {1}{3} (-3+n)}\right )}{2 a^{4/3} n} \\ & = -\frac {3 x^{-2 n/3}}{2 a n}-\frac {b^{2/3} \log \left (\sqrt [3]{a}+\sqrt [3]{b} x^{n/3}\right )}{a^{5/3} n}+\frac {b^{2/3} \log \left (a^{2/3}-\sqrt [3]{a} \sqrt [3]{b} x^{n/3}+b^{2/3} x^{2 n/3}\right )}{2 a^{5/3} n}-\frac {\left (3 b^{2/3}\right ) \text {Subst}\left (\int \frac {1}{-3-x^2} \, dx,x,1-\frac {2 \sqrt [3]{b} x^{1+\frac {1}{3} (-3+n)}}{\sqrt [3]{a}}\right )}{a^{5/3} n} \\ & = -\frac {3 x^{-2 n/3}}{2 a n}+\frac {\sqrt {3} b^{2/3} \tan ^{-1}\left (\frac {\sqrt [3]{a}-2 \sqrt [3]{b} x^{n/3}}{\sqrt {3} \sqrt [3]{a}}\right )}{a^{5/3} n}-\frac {b^{2/3} \log \left (\sqrt [3]{a}+\sqrt [3]{b} x^{n/3}\right )}{a^{5/3} n}+\frac {b^{2/3} \log \left (a^{2/3}-\sqrt [3]{a} \sqrt [3]{b} x^{n/3}+b^{2/3} x^{2 n/3}\right )}{2 a^{5/3} n} \\ \end{align*}
Result contains higher order function than in optimal. Order 5 vs. order 3 in optimal.
Time = 0.05 (sec) , antiderivative size = 34, normalized size of antiderivative = 0.21 \[ \int \frac {x^{-1-\frac {2 n}{3}}}{a+b x^n} \, dx=-\frac {3 x^{-2 n/3} \operatorname {Hypergeometric2F1}\left (-\frac {2}{3},1,\frac {1}{3},-\frac {b x^n}{a}\right )}{2 a n} \]
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Result contains higher order function than in optimal. Order 9 vs. order 3.
Time = 3.79 (sec) , antiderivative size = 54, normalized size of antiderivative = 0.34
method | result | size |
risch | \(-\frac {3 x^{-\frac {2 n}{3}}}{2 a n}+\left (\munderset {\textit {\_R} =\operatorname {RootOf}\left (a^{5} n^{3} \textit {\_Z}^{3}+b^{2}\right )}{\sum }\textit {\_R} \ln \left (x^{\frac {n}{3}}-\frac {a^{2} n \textit {\_R}}{b}\right )\right )\) | \(54\) |
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Time = 0.32 (sec) , antiderivative size = 178, normalized size of antiderivative = 1.11 \[ \int \frac {x^{-1-\frac {2 n}{3}}}{a+b x^n} \, dx=-\frac {3 \, x x^{-\frac {2}{3} \, n - 1} - 2 \, \sqrt {3} \left (-\frac {b^{2}}{a^{2}}\right )^{\frac {1}{3}} \arctan \left (\frac {2 \, \sqrt {3} a \sqrt {x} x^{-\frac {1}{3} \, n - \frac {1}{2}} \left (-\frac {b^{2}}{a^{2}}\right )^{\frac {1}{3}} + \sqrt {3} b}{3 \, b}\right ) + \left (-\frac {b^{2}}{a^{2}}\right )^{\frac {1}{3}} \log \left (-\frac {a \sqrt {x} x^{-\frac {1}{3} \, n - \frac {1}{2}} \left (-\frac {b^{2}}{a^{2}}\right )^{\frac {2}{3}} - b x x^{-\frac {2}{3} \, n - 1} + b \left (-\frac {b^{2}}{a^{2}}\right )^{\frac {1}{3}}}{x}\right ) - 2 \, \left (-\frac {b^{2}}{a^{2}}\right )^{\frac {1}{3}} \log \left (\frac {b x x^{-\frac {1}{3} \, n - \frac {1}{2}} + a \sqrt {x} \left (-\frac {b^{2}}{a^{2}}\right )^{\frac {2}{3}}}{x}\right )}{2 \, a n} \]
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Result contains complex when optimal does not.
Time = 1.04 (sec) , antiderivative size = 192, normalized size of antiderivative = 1.20 \[ \int \frac {x^{-1-\frac {2 n}{3}}}{a+b x^n} \, dx=\frac {x^{- \frac {2 n}{3}} \Gamma \left (- \frac {2}{3}\right )}{a n \Gamma \left (\frac {1}{3}\right )} - \frac {2 b^{\frac {2}{3}} e^{- \frac {i \pi }{3}} \log {\left (1 - \frac {\sqrt [3]{b} x^{\frac {n}{3}} e^{\frac {i \pi }{3}}}{\sqrt [3]{a}} \right )} \Gamma \left (- \frac {2}{3}\right )}{3 a^{\frac {5}{3}} n \Gamma \left (\frac {1}{3}\right )} + \frac {2 b^{\frac {2}{3}} \log {\left (1 - \frac {\sqrt [3]{b} x^{\frac {n}{3}} e^{i \pi }}{\sqrt [3]{a}} \right )} \Gamma \left (- \frac {2}{3}\right )}{3 a^{\frac {5}{3}} n \Gamma \left (\frac {1}{3}\right )} - \frac {2 b^{\frac {2}{3}} e^{\frac {i \pi }{3}} \log {\left (1 - \frac {\sqrt [3]{b} x^{\frac {n}{3}} e^{\frac {5 i \pi }{3}}}{\sqrt [3]{a}} \right )} \Gamma \left (- \frac {2}{3}\right )}{3 a^{\frac {5}{3}} n \Gamma \left (\frac {1}{3}\right )} \]
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\[ \int \frac {x^{-1-\frac {2 n}{3}}}{a+b x^n} \, dx=\int { \frac {x^{-\frac {2}{3} \, n - 1}}{b x^{n} + a} \,d x } \]
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\[ \int \frac {x^{-1-\frac {2 n}{3}}}{a+b x^n} \, dx=\int { \frac {x^{-\frac {2}{3} \, n - 1}}{b x^{n} + a} \,d x } \]
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Timed out. \[ \int \frac {x^{-1-\frac {2 n}{3}}}{a+b x^n} \, dx=\int \frac {1}{x^{\frac {2\,n}{3}+1}\,\left (a+b\,x^n\right )} \,d x \]
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