Integrand size = 20, antiderivative size = 81 \[ \int \frac {x^2 (A+B x)}{\sqrt {a+b x^2}} \, dx=\frac {B x^2 \sqrt {a+b x^2}}{3 b}-\frac {(4 a B-3 A b x) \sqrt {a+b x^2}}{6 b^2}-\frac {a A \text {arctanh}\left (\frac {\sqrt {b} x}{\sqrt {a+b x^2}}\right )}{2 b^{3/2}} \]
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Time = 0.03 (sec) , antiderivative size = 81, normalized size of antiderivative = 1.00, number of steps used = 4, number of rules used = 4, \(\frac {\text {number of rules}}{\text {integrand size}}\) = 0.200, Rules used = {847, 794, 223, 212} \[ \int \frac {x^2 (A+B x)}{\sqrt {a+b x^2}} \, dx=-\frac {a A \text {arctanh}\left (\frac {\sqrt {b} x}{\sqrt {a+b x^2}}\right )}{2 b^{3/2}}-\frac {\sqrt {a+b x^2} (4 a B-3 A b x)}{6 b^2}+\frac {B x^2 \sqrt {a+b x^2}}{3 b} \]
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Rule 212
Rule 223
Rule 794
Rule 847
Rubi steps \begin{align*} \text {integral}& = \frac {B x^2 \sqrt {a+b x^2}}{3 b}+\frac {\int \frac {x (-2 a B+3 A b x)}{\sqrt {a+b x^2}} \, dx}{3 b} \\ & = \frac {B x^2 \sqrt {a+b x^2}}{3 b}-\frac {(4 a B-3 A b x) \sqrt {a+b x^2}}{6 b^2}-\frac {(a A) \int \frac {1}{\sqrt {a+b x^2}} \, dx}{2 b} \\ & = \frac {B x^2 \sqrt {a+b x^2}}{3 b}-\frac {(4 a B-3 A b x) \sqrt {a+b x^2}}{6 b^2}-\frac {(a A) \text {Subst}\left (\int \frac {1}{1-b x^2} \, dx,x,\frac {x}{\sqrt {a+b x^2}}\right )}{2 b} \\ & = \frac {B x^2 \sqrt {a+b x^2}}{3 b}-\frac {(4 a B-3 A b x) \sqrt {a+b x^2}}{6 b^2}-\frac {a A \tanh ^{-1}\left (\frac {\sqrt {b} x}{\sqrt {a+b x^2}}\right )}{2 b^{3/2}} \\ \end{align*}
Time = 0.31 (sec) , antiderivative size = 74, normalized size of antiderivative = 0.91 \[ \int \frac {x^2 (A+B x)}{\sqrt {a+b x^2}} \, dx=\frac {\sqrt {a+b x^2} \left (-4 a B+3 A b x+2 b B x^2\right )}{6 b^2}-\frac {a A \text {arctanh}\left (\frac {\sqrt {b} x}{-\sqrt {a}+\sqrt {a+b x^2}}\right )}{b^{3/2}} \]
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Time = 3.38 (sec) , antiderivative size = 56, normalized size of antiderivative = 0.69
method | result | size |
risch | \(\frac {\left (2 b B \,x^{2}+3 A b x -4 B a \right ) \sqrt {b \,x^{2}+a}}{6 b^{2}}-\frac {a A \ln \left (x \sqrt {b}+\sqrt {b \,x^{2}+a}\right )}{2 b^{\frac {3}{2}}}\) | \(56\) |
default | \(B \left (\frac {x^{2} \sqrt {b \,x^{2}+a}}{3 b}-\frac {2 a \sqrt {b \,x^{2}+a}}{3 b^{2}}\right )+A \left (\frac {x \sqrt {b \,x^{2}+a}}{2 b}-\frac {a \ln \left (x \sqrt {b}+\sqrt {b \,x^{2}+a}\right )}{2 b^{\frac {3}{2}}}\right )\) | \(77\) |
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Time = 0.27 (sec) , antiderivative size = 127, normalized size of antiderivative = 1.57 \[ \int \frac {x^2 (A+B x)}{\sqrt {a+b x^2}} \, dx=\left [\frac {3 \, A a \sqrt {b} \log \left (-2 \, b x^{2} + 2 \, \sqrt {b x^{2} + a} \sqrt {b} x - a\right ) + 2 \, {\left (2 \, B b x^{2} + 3 \, A b x - 4 \, B a\right )} \sqrt {b x^{2} + a}}{12 \, b^{2}}, \frac {3 \, A a \sqrt {-b} \arctan \left (\frac {\sqrt {-b} x}{\sqrt {b x^{2} + a}}\right ) + {\left (2 \, B b x^{2} + 3 \, A b x - 4 \, B a\right )} \sqrt {b x^{2} + a}}{6 \, b^{2}}\right ] \]
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Time = 0.39 (sec) , antiderivative size = 102, normalized size of antiderivative = 1.26 \[ \int \frac {x^2 (A+B x)}{\sqrt {a+b x^2}} \, dx=\begin {cases} - \frac {A a \left (\begin {cases} \frac {\log {\left (2 \sqrt {b} \sqrt {a + b x^{2}} + 2 b x \right )}}{\sqrt {b}} & \text {for}\: a \neq 0 \\\frac {x \log {\left (x \right )}}{\sqrt {b x^{2}}} & \text {otherwise} \end {cases}\right )}{2 b} + \sqrt {a + b x^{2}} \left (\frac {A x}{2 b} - \frac {2 B a}{3 b^{2}} + \frac {B x^{2}}{3 b}\right ) & \text {for}\: b \neq 0 \\\frac {\frac {A x^{3}}{3} + \frac {B x^{4}}{4}}{\sqrt {a}} & \text {otherwise} \end {cases} \]
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Time = 0.20 (sec) , antiderivative size = 67, normalized size of antiderivative = 0.83 \[ \int \frac {x^2 (A+B x)}{\sqrt {a+b x^2}} \, dx=\frac {\sqrt {b x^{2} + a} B x^{2}}{3 \, b} + \frac {\sqrt {b x^{2} + a} A x}{2 \, b} - \frac {A a \operatorname {arsinh}\left (\frac {b x}{\sqrt {a b}}\right )}{2 \, b^{\frac {3}{2}}} - \frac {2 \, \sqrt {b x^{2} + a} B a}{3 \, b^{2}} \]
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Time = 0.31 (sec) , antiderivative size = 61, normalized size of antiderivative = 0.75 \[ \int \frac {x^2 (A+B x)}{\sqrt {a+b x^2}} \, dx=\frac {1}{6} \, \sqrt {b x^{2} + a} {\left ({\left (\frac {2 \, B x}{b} + \frac {3 \, A}{b}\right )} x - \frac {4 \, B a}{b^{2}}\right )} + \frac {A a \log \left ({\left | -\sqrt {b} x + \sqrt {b x^{2} + a} \right |}\right )}{2 \, b^{\frac {3}{2}}} \]
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Time = 6.34 (sec) , antiderivative size = 93, normalized size of antiderivative = 1.15 \[ \int \frac {x^2 (A+B x)}{\sqrt {a+b x^2}} \, dx=\left \{\begin {array}{cl} \frac {3\,B\,x^4+4\,A\,x^3}{12\,\sqrt {a}} & \text {\ if\ \ }b=0\\ \frac {A\,x\,\sqrt {b\,x^2+a}}{2\,b}-\frac {A\,a\,\ln \left (2\,\sqrt {b}\,x+2\,\sqrt {b\,x^2+a}\right )}{2\,b^{3/2}}-\frac {B\,\sqrt {b\,x^2+a}\,\left (2\,a-b\,x^2\right )}{3\,b^2} & \text {\ if\ \ }b\neq 0 \end {array}\right . \]
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