Integrand size = 20, antiderivative size = 60 \[ \int \frac {x^3 \left (c+d x^2\right )}{\left (a+b x^2\right )^2} \, dx=\frac {d x^2}{2 b^2}+\frac {a (b c-a d)}{2 b^3 \left (a+b x^2\right )}+\frac {(b c-2 a d) \log \left (a+b x^2\right )}{2 b^3} \]
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Time = 0.05 (sec) , antiderivative size = 60, normalized size of antiderivative = 1.00, number of steps used = 3, number of rules used = 2, \(\frac {\text {number of rules}}{\text {integrand size}}\) = 0.100, Rules used = {457, 78} \[ \int \frac {x^3 \left (c+d x^2\right )}{\left (a+b x^2\right )^2} \, dx=\frac {a (b c-a d)}{2 b^3 \left (a+b x^2\right )}+\frac {(b c-2 a d) \log \left (a+b x^2\right )}{2 b^3}+\frac {d x^2}{2 b^2} \]
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Rule 78
Rule 457
Rubi steps \begin{align*} \text {integral}& = \frac {1}{2} \text {Subst}\left (\int \frac {x (c+d x)}{(a+b x)^2} \, dx,x,x^2\right ) \\ & = \frac {1}{2} \text {Subst}\left (\int \left (\frac {d}{b^2}+\frac {a (-b c+a d)}{b^2 (a+b x)^2}+\frac {b c-2 a d}{b^2 (a+b x)}\right ) \, dx,x,x^2\right ) \\ & = \frac {d x^2}{2 b^2}+\frac {a (b c-a d)}{2 b^3 \left (a+b x^2\right )}+\frac {(b c-2 a d) \log \left (a+b x^2\right )}{2 b^3} \\ \end{align*}
Time = 0.03 (sec) , antiderivative size = 50, normalized size of antiderivative = 0.83 \[ \int \frac {x^3 \left (c+d x^2\right )}{\left (a+b x^2\right )^2} \, dx=\frac {b d x^2+\frac {a (b c-a d)}{a+b x^2}+(b c-2 a d) \log \left (a+b x^2\right )}{2 b^3} \]
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Time = 2.65 (sec) , antiderivative size = 59, normalized size of antiderivative = 0.98
method | result | size |
norman | \(\frac {-\frac {a \left (2 a d -b c \right )}{2 b^{3}}+\frac {d \,x^{4}}{2 b}}{b \,x^{2}+a}-\frac {\left (2 a d -b c \right ) \ln \left (b \,x^{2}+a \right )}{2 b^{3}}\) | \(59\) |
default | \(\frac {d \,x^{2}}{2 b^{2}}-\frac {\frac {\left (2 a d -b c \right ) \ln \left (b \,x^{2}+a \right )}{b}+\frac {\left (a d -b c \right ) a}{b \left (b \,x^{2}+a \right )}}{2 b^{2}}\) | \(60\) |
risch | \(\frac {d \,x^{2}}{2 b^{2}}-\frac {a^{2} d}{2 b^{3} \left (b \,x^{2}+a \right )}+\frac {a c}{2 b^{2} \left (b \,x^{2}+a \right )}-\frac {\ln \left (b \,x^{2}+a \right ) a d}{b^{3}}+\frac {c \ln \left (b \,x^{2}+a \right )}{2 b^{2}}\) | \(74\) |
parallelrisch | \(-\frac {-b^{2} d \,x^{4}+2 \ln \left (b \,x^{2}+a \right ) x^{2} a b d -\ln \left (b \,x^{2}+a \right ) x^{2} b^{2} c +2 \ln \left (b \,x^{2}+a \right ) a^{2} d -\ln \left (b \,x^{2}+a \right ) a b c +2 a^{2} d -a b c}{2 b^{3} \left (b \,x^{2}+a \right )}\) | \(96\) |
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Time = 0.24 (sec) , antiderivative size = 78, normalized size of antiderivative = 1.30 \[ \int \frac {x^3 \left (c+d x^2\right )}{\left (a+b x^2\right )^2} \, dx=\frac {b^{2} d x^{4} + a b d x^{2} + a b c - a^{2} d + {\left (a b c - 2 \, a^{2} d + {\left (b^{2} c - 2 \, a b d\right )} x^{2}\right )} \log \left (b x^{2} + a\right )}{2 \, {\left (b^{4} x^{2} + a b^{3}\right )}} \]
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Time = 0.32 (sec) , antiderivative size = 56, normalized size of antiderivative = 0.93 \[ \int \frac {x^3 \left (c+d x^2\right )}{\left (a+b x^2\right )^2} \, dx=\frac {- a^{2} d + a b c}{2 a b^{3} + 2 b^{4} x^{2}} + \frac {d x^{2}}{2 b^{2}} - \frac {\left (2 a d - b c\right ) \log {\left (a + b x^{2} \right )}}{2 b^{3}} \]
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Time = 0.20 (sec) , antiderivative size = 59, normalized size of antiderivative = 0.98 \[ \int \frac {x^3 \left (c+d x^2\right )}{\left (a+b x^2\right )^2} \, dx=\frac {d x^{2}}{2 \, b^{2}} + \frac {a b c - a^{2} d}{2 \, {\left (b^{4} x^{2} + a b^{3}\right )}} + \frac {{\left (b c - 2 \, a d\right )} \log \left (b x^{2} + a\right )}{2 \, b^{3}} \]
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Time = 0.29 (sec) , antiderivative size = 90, normalized size of antiderivative = 1.50 \[ \int \frac {x^3 \left (c+d x^2\right )}{\left (a+b x^2\right )^2} \, dx=\frac {\frac {{\left (b x^{2} + a\right )} d}{b^{2}} - \frac {{\left (b c - 2 \, a d\right )} \log \left (\frac {{\left | b x^{2} + a \right |}}{{\left (b x^{2} + a\right )}^{2} {\left | b \right |}}\right )}{b^{2}} + \frac {\frac {a b^{2} c}{b x^{2} + a} - \frac {a^{2} b d}{b x^{2} + a}}{b^{3}}}{2 \, b} \]
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Time = 0.08 (sec) , antiderivative size = 63, normalized size of antiderivative = 1.05 \[ \int \frac {x^3 \left (c+d x^2\right )}{\left (a+b x^2\right )^2} \, dx=\frac {d\,x^2}{2\,b^2}-\frac {\ln \left (b\,x^2+a\right )\,\left (2\,a\,d-b\,c\right )}{2\,b^3}-\frac {a^2\,d-a\,b\,c}{2\,b\,\left (b^3\,x^2+a\,b^2\right )} \]
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