Integrand size = 17, antiderivative size = 83 \[ \int \frac {1}{\sqrt {a+\frac {b}{x}} x^{7/2}} \, dx=-\frac {\sqrt {a+\frac {b}{x}}}{2 b x^{3/2}}+\frac {3 a \sqrt {a+\frac {b}{x}}}{4 b^2 \sqrt {x}}-\frac {3 a^2 \text {arctanh}\left (\frac {\sqrt {b}}{\sqrt {a+\frac {b}{x}} \sqrt {x}}\right )}{4 b^{5/2}} \]
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Time = 0.03 (sec) , antiderivative size = 83, normalized size of antiderivative = 1.00, number of steps used = 5, number of rules used = 4, \(\frac {\text {number of rules}}{\text {integrand size}}\) = 0.235, Rules used = {344, 327, 223, 212} \[ \int \frac {1}{\sqrt {a+\frac {b}{x}} x^{7/2}} \, dx=-\frac {3 a^2 \text {arctanh}\left (\frac {\sqrt {b}}{\sqrt {x} \sqrt {a+\frac {b}{x}}}\right )}{4 b^{5/2}}+\frac {3 a \sqrt {a+\frac {b}{x}}}{4 b^2 \sqrt {x}}-\frac {\sqrt {a+\frac {b}{x}}}{2 b x^{3/2}} \]
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Rule 212
Rule 223
Rule 327
Rule 344
Rubi steps \begin{align*} \text {integral}& = -\left (2 \text {Subst}\left (\int \frac {x^4}{\sqrt {a+b x^2}} \, dx,x,\frac {1}{\sqrt {x}}\right )\right ) \\ & = -\frac {\sqrt {a+\frac {b}{x}}}{2 b x^{3/2}}+\frac {(3 a) \text {Subst}\left (\int \frac {x^2}{\sqrt {a+b x^2}} \, dx,x,\frac {1}{\sqrt {x}}\right )}{2 b} \\ & = -\frac {\sqrt {a+\frac {b}{x}}}{2 b x^{3/2}}+\frac {3 a \sqrt {a+\frac {b}{x}}}{4 b^2 \sqrt {x}}-\frac {\left (3 a^2\right ) \text {Subst}\left (\int \frac {1}{\sqrt {a+b x^2}} \, dx,x,\frac {1}{\sqrt {x}}\right )}{4 b^2} \\ & = -\frac {\sqrt {a+\frac {b}{x}}}{2 b x^{3/2}}+\frac {3 a \sqrt {a+\frac {b}{x}}}{4 b^2 \sqrt {x}}-\frac {\left (3 a^2\right ) \text {Subst}\left (\int \frac {1}{1-b x^2} \, dx,x,\frac {1}{\sqrt {a+\frac {b}{x}} \sqrt {x}}\right )}{4 b^2} \\ & = -\frac {\sqrt {a+\frac {b}{x}}}{2 b x^{3/2}}+\frac {3 a \sqrt {a+\frac {b}{x}}}{4 b^2 \sqrt {x}}-\frac {3 a^2 \tanh ^{-1}\left (\frac {\sqrt {b}}{\sqrt {a+\frac {b}{x}} \sqrt {x}}\right )}{4 b^{5/2}} \\ \end{align*}
Time = 10.08 (sec) , antiderivative size = 93, normalized size of antiderivative = 1.12 \[ \int \frac {1}{\sqrt {a+\frac {b}{x}} x^{7/2}} \, dx=\frac {\sqrt {b} \left (-2 b^2+a b x+3 a^2 x^2\right )-3 a^{5/2} \sqrt {1+\frac {b}{a x}} x^{5/2} \text {arcsinh}\left (\frac {\sqrt {b}}{\sqrt {a} \sqrt {x}}\right )}{4 b^{5/2} \sqrt {a+\frac {b}{x}} x^{5/2}} \]
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Time = 0.04 (sec) , antiderivative size = 74, normalized size of antiderivative = 0.89
method | result | size |
default | \(-\frac {\sqrt {\frac {a x +b}{x}}\, \left (3 \,\operatorname {arctanh}\left (\frac {\sqrt {a x +b}}{\sqrt {b}}\right ) a^{2} x^{2}-3 a x \sqrt {a x +b}\, \sqrt {b}+2 b^{\frac {3}{2}} \sqrt {a x +b}\right )}{4 x^{\frac {3}{2}} b^{\frac {5}{2}} \sqrt {a x +b}}\) | \(74\) |
risch | \(\frac {\left (a x +b \right ) \left (3 a x -2 b \right )}{4 b^{2} x^{\frac {5}{2}} \sqrt {\frac {a x +b}{x}}}-\frac {3 a^{2} \operatorname {arctanh}\left (\frac {\sqrt {a x +b}}{\sqrt {b}}\right ) \sqrt {a x +b}}{4 b^{\frac {5}{2}} \sqrt {x}\, \sqrt {\frac {a x +b}{x}}}\) | \(75\) |
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Time = 0.30 (sec) , antiderivative size = 151, normalized size of antiderivative = 1.82 \[ \int \frac {1}{\sqrt {a+\frac {b}{x}} x^{7/2}} \, dx=\left [\frac {3 \, a^{2} \sqrt {b} x^{2} \log \left (\frac {a x - 2 \, \sqrt {b} \sqrt {x} \sqrt {\frac {a x + b}{x}} + 2 \, b}{x}\right ) + 2 \, {\left (3 \, a b x - 2 \, b^{2}\right )} \sqrt {x} \sqrt {\frac {a x + b}{x}}}{8 \, b^{3} x^{2}}, \frac {3 \, a^{2} \sqrt {-b} x^{2} \arctan \left (\frac {\sqrt {-b} \sqrt {x} \sqrt {\frac {a x + b}{x}}}{b}\right ) + {\left (3 \, a b x - 2 \, b^{2}\right )} \sqrt {x} \sqrt {\frac {a x + b}{x}}}{4 \, b^{3} x^{2}}\right ] \]
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Time = 10.27 (sec) , antiderivative size = 102, normalized size of antiderivative = 1.23 \[ \int \frac {1}{\sqrt {a+\frac {b}{x}} x^{7/2}} \, dx=\frac {3 a^{\frac {3}{2}}}{4 b^{2} \sqrt {x} \sqrt {1 + \frac {b}{a x}}} + \frac {\sqrt {a}}{4 b x^{\frac {3}{2}} \sqrt {1 + \frac {b}{a x}}} - \frac {3 a^{2} \operatorname {asinh}{\left (\frac {\sqrt {b}}{\sqrt {a} \sqrt {x}} \right )}}{4 b^{\frac {5}{2}}} - \frac {1}{2 \sqrt {a} x^{\frac {5}{2}} \sqrt {1 + \frac {b}{a x}}} \]
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Time = 0.28 (sec) , antiderivative size = 122, normalized size of antiderivative = 1.47 \[ \int \frac {1}{\sqrt {a+\frac {b}{x}} x^{7/2}} \, dx=\frac {3 \, a^{2} \log \left (\frac {\sqrt {a + \frac {b}{x}} \sqrt {x} - \sqrt {b}}{\sqrt {a + \frac {b}{x}} \sqrt {x} + \sqrt {b}}\right )}{8 \, b^{\frac {5}{2}}} + \frac {3 \, {\left (a + \frac {b}{x}\right )}^{\frac {3}{2}} a^{2} x^{\frac {3}{2}} - 5 \, \sqrt {a + \frac {b}{x}} a^{2} b \sqrt {x}}{4 \, {\left ({\left (a + \frac {b}{x}\right )}^{2} b^{2} x^{2} - 2 \, {\left (a + \frac {b}{x}\right )} b^{3} x + b^{4}\right )}} \]
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Time = 0.33 (sec) , antiderivative size = 73, normalized size of antiderivative = 0.88 \[ \int \frac {1}{\sqrt {a+\frac {b}{x}} x^{7/2}} \, dx=\frac {\frac {3 \, a^{3} \arctan \left (\frac {\sqrt {a x + b}}{\sqrt {-b}}\right )}{\sqrt {-b} b^{2}} + \frac {3 \, {\left (a x + b\right )}^{\frac {3}{2}} a^{3} - 5 \, \sqrt {a x + b} a^{3} b}{a^{2} b^{2} x^{2}}}{4 \, a \mathrm {sgn}\left (x\right )} \]
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Timed out. \[ \int \frac {1}{\sqrt {a+\frac {b}{x}} x^{7/2}} \, dx=\int \frac {1}{x^{7/2}\,\sqrt {a+\frac {b}{x}}} \,d x \]
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