Integrand size = 16, antiderivative size = 87 \[ \int x^{3/2} \sqrt {2-b x} \, dx=-\frac {\sqrt {x} \sqrt {2-b x}}{2 b^2}-\frac {x^{3/2} \sqrt {2-b x}}{6 b}+\frac {1}{3} x^{5/2} \sqrt {2-b x}+\frac {\arcsin \left (\frac {\sqrt {b} \sqrt {x}}{\sqrt {2}}\right )}{b^{5/2}} \]
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Time = 0.02 (sec) , antiderivative size = 87, normalized size of antiderivative = 1.00, number of steps used = 5, number of rules used = 3, \(\frac {\text {number of rules}}{\text {integrand size}}\) = 0.188, Rules used = {52, 56, 222} \[ \int x^{3/2} \sqrt {2-b x} \, dx=\frac {\arcsin \left (\frac {\sqrt {b} \sqrt {x}}{\sqrt {2}}\right )}{b^{5/2}}-\frac {\sqrt {x} \sqrt {2-b x}}{2 b^2}+\frac {1}{3} x^{5/2} \sqrt {2-b x}-\frac {x^{3/2} \sqrt {2-b x}}{6 b} \]
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Rule 52
Rule 56
Rule 222
Rubi steps \begin{align*} \text {integral}& = \frac {1}{3} x^{5/2} \sqrt {2-b x}+\frac {1}{3} \int \frac {x^{3/2}}{\sqrt {2-b x}} \, dx \\ & = -\frac {x^{3/2} \sqrt {2-b x}}{6 b}+\frac {1}{3} x^{5/2} \sqrt {2-b x}+\frac {\int \frac {\sqrt {x}}{\sqrt {2-b x}} \, dx}{2 b} \\ & = -\frac {\sqrt {x} \sqrt {2-b x}}{2 b^2}-\frac {x^{3/2} \sqrt {2-b x}}{6 b}+\frac {1}{3} x^{5/2} \sqrt {2-b x}+\frac {\int \frac {1}{\sqrt {x} \sqrt {2-b x}} \, dx}{2 b^2} \\ & = -\frac {\sqrt {x} \sqrt {2-b x}}{2 b^2}-\frac {x^{3/2} \sqrt {2-b x}}{6 b}+\frac {1}{3} x^{5/2} \sqrt {2-b x}+\frac {\text {Subst}\left (\int \frac {1}{\sqrt {2-b x^2}} \, dx,x,\sqrt {x}\right )}{b^2} \\ & = -\frac {\sqrt {x} \sqrt {2-b x}}{2 b^2}-\frac {x^{3/2} \sqrt {2-b x}}{6 b}+\frac {1}{3} x^{5/2} \sqrt {2-b x}+\frac {\sin ^{-1}\left (\frac {\sqrt {b} \sqrt {x}}{\sqrt {2}}\right )}{b^{5/2}} \\ \end{align*}
Time = 0.25 (sec) , antiderivative size = 76, normalized size of antiderivative = 0.87 \[ \int x^{3/2} \sqrt {2-b x} \, dx=\frac {\sqrt {x} \sqrt {2-b x} \left (-3-b x+2 b^2 x^2\right )}{6 b^2}-\frac {2 \arctan \left (\frac {\sqrt {b} \sqrt {x}}{\sqrt {2}-\sqrt {2-b x}}\right )}{b^{5/2}} \]
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Time = 0.08 (sec) , antiderivative size = 81, normalized size of antiderivative = 0.93
method | result | size |
meijerg | \(\frac {\frac {\sqrt {\pi }\, \sqrt {x}\, \sqrt {2}\, \left (-b \right )^{\frac {5}{2}} \left (-10 b^{2} x^{2}+5 b x +15\right ) \sqrt {-\frac {b x}{2}+1}}{30 b^{2}}-\frac {\sqrt {\pi }\, \left (-b \right )^{\frac {5}{2}} \arcsin \left (\frac {\sqrt {b}\, \sqrt {x}\, \sqrt {2}}{2}\right )}{b^{\frac {5}{2}}}}{\left (-b \right )^{\frac {3}{2}} \sqrt {\pi }\, b}\) | \(81\) |
default | \(-\frac {x^{\frac {3}{2}} \left (-b x +2\right )^{\frac {3}{2}}}{3 b}+\frac {-\frac {\sqrt {x}\, \left (-b x +2\right )^{\frac {3}{2}}}{2 b}+\frac {\sqrt {x}\, \sqrt {-b x +2}+\frac {\sqrt {\left (-b x +2\right ) x}\, \arctan \left (\frac {\sqrt {b}\, \left (x -\frac {1}{b}\right )}{\sqrt {-b \,x^{2}+2 x}}\right )}{\sqrt {-b x +2}\, \sqrt {x}\, \sqrt {b}}}{2 b}}{b}\) | \(106\) |
risch | \(-\frac {\left (2 b^{2} x^{2}-b x -3\right ) \sqrt {x}\, \left (b x -2\right ) \sqrt {\left (-b x +2\right ) x}}{6 b^{2} \sqrt {-x \left (b x -2\right )}\, \sqrt {-b x +2}}+\frac {\arctan \left (\frac {\sqrt {b}\, \left (x -\frac {1}{b}\right )}{\sqrt {-b \,x^{2}+2 x}}\right ) \sqrt {\left (-b x +2\right ) x}}{2 b^{\frac {5}{2}} \sqrt {x}\, \sqrt {-b x +2}}\) | \(107\) |
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Time = 0.24 (sec) , antiderivative size = 125, normalized size of antiderivative = 1.44 \[ \int x^{3/2} \sqrt {2-b x} \, dx=\left [\frac {{\left (2 \, b^{3} x^{2} - b^{2} x - 3 \, b\right )} \sqrt {-b x + 2} \sqrt {x} - 3 \, \sqrt {-b} \log \left (-b x + \sqrt {-b x + 2} \sqrt {-b} \sqrt {x} + 1\right )}{6 \, b^{3}}, \frac {{\left (2 \, b^{3} x^{2} - b^{2} x - 3 \, b\right )} \sqrt {-b x + 2} \sqrt {x} - 6 \, \sqrt {b} \arctan \left (\frac {\sqrt {-b x + 2}}{\sqrt {b} \sqrt {x}}\right )}{6 \, b^{3}}\right ] \]
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Result contains complex when optimal does not.
Time = 7.60 (sec) , antiderivative size = 194, normalized size of antiderivative = 2.23 \[ \int x^{3/2} \sqrt {2-b x} \, dx=\begin {cases} \frac {i b x^{\frac {7}{2}}}{3 \sqrt {b x - 2}} - \frac {5 i x^{\frac {5}{2}}}{6 \sqrt {b x - 2}} - \frac {i x^{\frac {3}{2}}}{6 b \sqrt {b x - 2}} + \frac {i \sqrt {x}}{b^{2} \sqrt {b x - 2}} - \frac {i \operatorname {acosh}{\left (\frac {\sqrt {2} \sqrt {b} \sqrt {x}}{2} \right )}}{b^{\frac {5}{2}}} & \text {for}\: \left |{b x}\right | > 2 \\- \frac {b x^{\frac {7}{2}}}{3 \sqrt {- b x + 2}} + \frac {5 x^{\frac {5}{2}}}{6 \sqrt {- b x + 2}} + \frac {x^{\frac {3}{2}}}{6 b \sqrt {- b x + 2}} - \frac {\sqrt {x}}{b^{2} \sqrt {- b x + 2}} + \frac {\operatorname {asin}{\left (\frac {\sqrt {2} \sqrt {b} \sqrt {x}}{2} \right )}}{b^{\frac {5}{2}}} & \text {otherwise} \end {cases} \]
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Time = 0.31 (sec) , antiderivative size = 117, normalized size of antiderivative = 1.34 \[ \int x^{3/2} \sqrt {2-b x} \, dx=\frac {\frac {3 \, \sqrt {-b x + 2} b^{2}}{\sqrt {x}} - \frac {8 \, {\left (-b x + 2\right )}^{\frac {3}{2}} b}{x^{\frac {3}{2}}} - \frac {3 \, {\left (-b x + 2\right )}^{\frac {5}{2}}}{x^{\frac {5}{2}}}}{3 \, {\left (b^{5} - \frac {3 \, {\left (b x - 2\right )} b^{4}}{x} + \frac {3 \, {\left (b x - 2\right )}^{2} b^{3}}{x^{2}} - \frac {{\left (b x - 2\right )}^{3} b^{2}}{x^{3}}\right )}} - \frac {\arctan \left (\frac {\sqrt {-b x + 2}}{\sqrt {b} \sqrt {x}}\right )}{b^{\frac {5}{2}}} \]
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Leaf count of result is larger than twice the leaf count of optimal. 178 vs. \(2 (62) = 124\).
Time = 12.02 (sec) , antiderivative size = 178, normalized size of antiderivative = 2.05 \[ \int x^{3/2} \sqrt {2-b x} \, dx=\frac {\frac {{\left (\sqrt {{\left (b x - 2\right )} b + 2 \, b} \sqrt {-b x + 2} {\left ({\left (b x - 2\right )} {\left (\frac {2 \, {\left (b x - 2\right )}}{b^{2}} + \frac {13}{b^{2}}\right )} + \frac {33}{b^{2}}\right )} - \frac {30 \, \log \left ({\left | -\sqrt {-b x + 2} \sqrt {-b} + \sqrt {{\left (b x - 2\right )} b + 2 \, b} \right |}\right )}{\sqrt {-b} b}\right )} {\left | b \right |}}{b} - \frac {6 \, {\left (\sqrt {{\left (b x - 2\right )} b + 2 \, b} {\left (b x + 3\right )} \sqrt {-b x + 2} - \frac {6 \, b \log \left ({\left | -\sqrt {-b x + 2} \sqrt {-b} + \sqrt {{\left (b x - 2\right )} b + 2 \, b} \right |}\right )}{\sqrt {-b}}\right )} {\left | b \right |}}{b^{3}}}{6 \, b} \]
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Timed out. \[ \int x^{3/2} \sqrt {2-b x} \, dx=\int x^{3/2}\,\sqrt {2-b\,x} \,d x \]
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