Integrand size = 13, antiderivative size = 70 \[ \int \frac {x^{5/2}}{(a+b x)^2} \, dx=-\frac {5 a \sqrt {x}}{b^3}+\frac {5 x^{3/2}}{3 b^2}-\frac {x^{5/2}}{b (a+b x)}+\frac {5 a^{3/2} \arctan \left (\frac {\sqrt {b} \sqrt {x}}{\sqrt {a}}\right )}{b^{7/2}} \]
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Time = 0.02 (sec) , antiderivative size = 70, normalized size of antiderivative = 1.00, number of steps used = 5, number of rules used = 4, \(\frac {\text {number of rules}}{\text {integrand size}}\) = 0.308, Rules used = {43, 52, 65, 211} \[ \int \frac {x^{5/2}}{(a+b x)^2} \, dx=\frac {5 a^{3/2} \arctan \left (\frac {\sqrt {b} \sqrt {x}}{\sqrt {a}}\right )}{b^{7/2}}-\frac {5 a \sqrt {x}}{b^3}-\frac {x^{5/2}}{b (a+b x)}+\frac {5 x^{3/2}}{3 b^2} \]
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Rule 43
Rule 52
Rule 65
Rule 211
Rubi steps \begin{align*} \text {integral}& = -\frac {x^{5/2}}{b (a+b x)}+\frac {5 \int \frac {x^{3/2}}{a+b x} \, dx}{2 b} \\ & = \frac {5 x^{3/2}}{3 b^2}-\frac {x^{5/2}}{b (a+b x)}-\frac {(5 a) \int \frac {\sqrt {x}}{a+b x} \, dx}{2 b^2} \\ & = -\frac {5 a \sqrt {x}}{b^3}+\frac {5 x^{3/2}}{3 b^2}-\frac {x^{5/2}}{b (a+b x)}+\frac {\left (5 a^2\right ) \int \frac {1}{\sqrt {x} (a+b x)} \, dx}{2 b^3} \\ & = -\frac {5 a \sqrt {x}}{b^3}+\frac {5 x^{3/2}}{3 b^2}-\frac {x^{5/2}}{b (a+b x)}+\frac {\left (5 a^2\right ) \text {Subst}\left (\int \frac {1}{a+b x^2} \, dx,x,\sqrt {x}\right )}{b^3} \\ & = -\frac {5 a \sqrt {x}}{b^3}+\frac {5 x^{3/2}}{3 b^2}-\frac {x^{5/2}}{b (a+b x)}+\frac {5 a^{3/2} \tan ^{-1}\left (\frac {\sqrt {b} \sqrt {x}}{\sqrt {a}}\right )}{b^{7/2}} \\ \end{align*}
Time = 0.08 (sec) , antiderivative size = 68, normalized size of antiderivative = 0.97 \[ \int \frac {x^{5/2}}{(a+b x)^2} \, dx=\frac {\sqrt {x} \left (-15 a^2-10 a b x+2 b^2 x^2\right )}{3 b^3 (a+b x)}+\frac {5 a^{3/2} \arctan \left (\frac {\sqrt {b} \sqrt {x}}{\sqrt {a}}\right )}{b^{7/2}} \]
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Time = 0.10 (sec) , antiderivative size = 56, normalized size of antiderivative = 0.80
method | result | size |
risch | \(-\frac {2 \left (-b x +6 a \right ) \sqrt {x}}{3 b^{3}}+\frac {a^{2} \left (-\frac {\sqrt {x}}{b x +a}+\frac {5 \arctan \left (\frac {b \sqrt {x}}{\sqrt {a b}}\right )}{\sqrt {a b}}\right )}{b^{3}}\) | \(56\) |
derivativedivides | \(-\frac {2 \left (-\frac {b \,x^{\frac {3}{2}}}{3}+2 a \sqrt {x}\right )}{b^{3}}+\frac {2 a^{2} \left (-\frac {\sqrt {x}}{2 \left (b x +a \right )}+\frac {5 \arctan \left (\frac {b \sqrt {x}}{\sqrt {a b}}\right )}{2 \sqrt {a b}}\right )}{b^{3}}\) | \(59\) |
default | \(-\frac {2 \left (-\frac {b \,x^{\frac {3}{2}}}{3}+2 a \sqrt {x}\right )}{b^{3}}+\frac {2 a^{2} \left (-\frac {\sqrt {x}}{2 \left (b x +a \right )}+\frac {5 \arctan \left (\frac {b \sqrt {x}}{\sqrt {a b}}\right )}{2 \sqrt {a b}}\right )}{b^{3}}\) | \(59\) |
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Time = 0.23 (sec) , antiderivative size = 161, normalized size of antiderivative = 2.30 \[ \int \frac {x^{5/2}}{(a+b x)^2} \, dx=\left [\frac {15 \, {\left (a b x + a^{2}\right )} \sqrt {-\frac {a}{b}} \log \left (\frac {b x + 2 \, b \sqrt {x} \sqrt {-\frac {a}{b}} - a}{b x + a}\right ) + 2 \, {\left (2 \, b^{2} x^{2} - 10 \, a b x - 15 \, a^{2}\right )} \sqrt {x}}{6 \, {\left (b^{4} x + a b^{3}\right )}}, \frac {15 \, {\left (a b x + a^{2}\right )} \sqrt {\frac {a}{b}} \arctan \left (\frac {b \sqrt {x} \sqrt {\frac {a}{b}}}{a}\right ) + {\left (2 \, b^{2} x^{2} - 10 \, a b x - 15 \, a^{2}\right )} \sqrt {x}}{3 \, {\left (b^{4} x + a b^{3}\right )}}\right ] \]
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Leaf count of result is larger than twice the leaf count of optimal. 389 vs. \(2 (63) = 126\).
Time = 12.89 (sec) , antiderivative size = 389, normalized size of antiderivative = 5.56 \[ \int \frac {x^{5/2}}{(a+b x)^2} \, dx=\begin {cases} \tilde {\infty } x^{\frac {3}{2}} & \text {for}\: a = 0 \wedge b = 0 \\\frac {2 x^{\frac {7}{2}}}{7 a^{2}} & \text {for}\: b = 0 \\\frac {2 x^{\frac {3}{2}}}{3 b^{2}} & \text {for}\: a = 0 \\\frac {15 a^{3} \log {\left (\sqrt {x} - \sqrt {- \frac {a}{b}} \right )}}{6 a b^{4} \sqrt {- \frac {a}{b}} + 6 b^{5} x \sqrt {- \frac {a}{b}}} - \frac {15 a^{3} \log {\left (\sqrt {x} + \sqrt {- \frac {a}{b}} \right )}}{6 a b^{4} \sqrt {- \frac {a}{b}} + 6 b^{5} x \sqrt {- \frac {a}{b}}} - \frac {30 a^{2} b \sqrt {x} \sqrt {- \frac {a}{b}}}{6 a b^{4} \sqrt {- \frac {a}{b}} + 6 b^{5} x \sqrt {- \frac {a}{b}}} + \frac {15 a^{2} b x \log {\left (\sqrt {x} - \sqrt {- \frac {a}{b}} \right )}}{6 a b^{4} \sqrt {- \frac {a}{b}} + 6 b^{5} x \sqrt {- \frac {a}{b}}} - \frac {15 a^{2} b x \log {\left (\sqrt {x} + \sqrt {- \frac {a}{b}} \right )}}{6 a b^{4} \sqrt {- \frac {a}{b}} + 6 b^{5} x \sqrt {- \frac {a}{b}}} - \frac {20 a b^{2} x^{\frac {3}{2}} \sqrt {- \frac {a}{b}}}{6 a b^{4} \sqrt {- \frac {a}{b}} + 6 b^{5} x \sqrt {- \frac {a}{b}}} + \frac {4 b^{3} x^{\frac {5}{2}} \sqrt {- \frac {a}{b}}}{6 a b^{4} \sqrt {- \frac {a}{b}} + 6 b^{5} x \sqrt {- \frac {a}{b}}} & \text {otherwise} \end {cases} \]
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Time = 0.30 (sec) , antiderivative size = 63, normalized size of antiderivative = 0.90 \[ \int \frac {x^{5/2}}{(a+b x)^2} \, dx=-\frac {a^{2} \sqrt {x}}{b^{4} x + a b^{3}} + \frac {5 \, a^{2} \arctan \left (\frac {b \sqrt {x}}{\sqrt {a b}}\right )}{\sqrt {a b} b^{3}} + \frac {2 \, {\left (b x^{\frac {3}{2}} - 6 \, a \sqrt {x}\right )}}{3 \, b^{3}} \]
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Time = 0.29 (sec) , antiderivative size = 65, normalized size of antiderivative = 0.93 \[ \int \frac {x^{5/2}}{(a+b x)^2} \, dx=\frac {5 \, a^{2} \arctan \left (\frac {b \sqrt {x}}{\sqrt {a b}}\right )}{\sqrt {a b} b^{3}} - \frac {a^{2} \sqrt {x}}{{\left (b x + a\right )} b^{3}} + \frac {2 \, {\left (b^{4} x^{\frac {3}{2}} - 6 \, a b^{3} \sqrt {x}\right )}}{3 \, b^{6}} \]
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Time = 0.12 (sec) , antiderivative size = 58, normalized size of antiderivative = 0.83 \[ \int \frac {x^{5/2}}{(a+b x)^2} \, dx=\frac {2\,x^{3/2}}{3\,b^2}-\frac {4\,a\,\sqrt {x}}{b^3}-\frac {a^2\,\sqrt {x}}{x\,b^4+a\,b^3}+\frac {5\,a^{3/2}\,\mathrm {atan}\left (\frac {\sqrt {b}\,\sqrt {x}}{\sqrt {a}}\right )}{b^{7/2}} \]
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