Integrand size = 20, antiderivative size = 54 \[ \int \frac {x^3 \left (c+d x^2\right )}{a+b x^2} \, dx=\frac {(b c-a d) x^2}{2 b^2}+\frac {d x^4}{4 b}-\frac {a (b c-a d) \log \left (a+b x^2\right )}{2 b^3} \]
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Time = 0.04 (sec) , antiderivative size = 54, 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} \[ \int \frac {x^3 \left (c+d x^2\right )}{a+b x^2} \, dx=-\frac {a (b c-a d) \log \left (a+b x^2\right )}{2 b^3}+\frac {x^2 (b c-a d)}{2 b^2}+\frac {d x^4}{4 b} \]
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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} \, dx,x,x^2\right ) \\ & = \frac {1}{2} \text {Subst}\left (\int \left (\frac {b c-a d}{b^2}+\frac {d x}{b}+\frac {a (-b c+a d)}{b^2 (a+b x)}\right ) \, dx,x,x^2\right ) \\ & = \frac {(b c-a d) x^2}{2 b^2}+\frac {d x^4}{4 b}-\frac {a (b c-a d) \log \left (a+b x^2\right )}{2 b^3} \\ \end{align*}
Time = 0.01 (sec) , antiderivative size = 47, normalized size of antiderivative = 0.87 \[ \int \frac {x^3 \left (c+d x^2\right )}{a+b x^2} \, dx=\frac {b x^2 \left (2 b c-2 a d+b d x^2\right )+2 a (-b c+a d) \log \left (a+b x^2\right )}{4 b^3} \]
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Time = 2.64 (sec) , antiderivative size = 49, normalized size of antiderivative = 0.91
method | result | size |
norman | \(\frac {d \,x^{4}}{4 b}-\frac {\left (a d -b c \right ) x^{2}}{2 b^{2}}+\frac {a \left (a d -b c \right ) \ln \left (b \,x^{2}+a \right )}{2 b^{3}}\) | \(49\) |
default | \(-\frac {-\frac {1}{2} b d \,x^{4}+a d \,x^{2}-c b \,x^{2}}{2 b^{2}}+\frac {a \left (a d -b c \right ) \ln \left (b \,x^{2}+a \right )}{2 b^{3}}\) | \(50\) |
parallelrisch | \(\frac {b^{2} d \,x^{4}-2 x^{2} a b d +2 b^{2} c \,x^{2}+2 \ln \left (b \,x^{2}+a \right ) a^{2} d -2 \ln \left (b \,x^{2}+a \right ) a b c}{4 b^{3}}\) | \(59\) |
risch | \(\frac {d \,x^{4}}{4 b}-\frac {d \,x^{2} a}{2 b^{2}}+\frac {c \,x^{2}}{2 b}+\frac {d \,a^{2}}{4 b^{3}}-\frac {a c}{2 b^{2}}+\frac {c^{2}}{4 b d}+\frac {a^{2} \ln \left (b \,x^{2}+a \right ) d}{2 b^{3}}-\frac {a c \ln \left (b \,x^{2}+a \right )}{2 b^{2}}\) | \(89\) |
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Time = 0.28 (sec) , antiderivative size = 51, normalized size of antiderivative = 0.94 \[ \int \frac {x^3 \left (c+d x^2\right )}{a+b x^2} \, dx=\frac {b^{2} d x^{4} + 2 \, {\left (b^{2} c - a b d\right )} x^{2} - 2 \, {\left (a b c - a^{2} d\right )} \log \left (b x^{2} + a\right )}{4 \, b^{3}} \]
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Time = 0.17 (sec) , antiderivative size = 46, normalized size of antiderivative = 0.85 \[ \int \frac {x^3 \left (c+d x^2\right )}{a+b x^2} \, dx=\frac {a \left (a d - b c\right ) \log {\left (a + b x^{2} \right )}}{2 b^{3}} + x^{2} \left (- \frac {a d}{2 b^{2}} + \frac {c}{2 b}\right ) + \frac {d x^{4}}{4 b} \]
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Time = 0.20 (sec) , antiderivative size = 50, normalized size of antiderivative = 0.93 \[ \int \frac {x^3 \left (c+d x^2\right )}{a+b x^2} \, dx=\frac {b d x^{4} + 2 \, {\left (b c - a d\right )} x^{2}}{4 \, b^{2}} - \frac {{\left (a b c - a^{2} d\right )} \log \left (b x^{2} + a\right )}{2 \, b^{3}} \]
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Time = 0.27 (sec) , antiderivative size = 52, normalized size of antiderivative = 0.96 \[ \int \frac {x^3 \left (c+d x^2\right )}{a+b x^2} \, dx=\frac {b d x^{4} + 2 \, b c x^{2} - 2 \, a d x^{2}}{4 \, b^{2}} - \frac {{\left (a b c - a^{2} d\right )} \log \left ({\left | b x^{2} + a \right |}\right )}{2 \, b^{3}} \]
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Time = 0.07 (sec) , antiderivative size = 52, normalized size of antiderivative = 0.96 \[ \int \frac {x^3 \left (c+d x^2\right )}{a+b x^2} \, dx=x^2\,\left (\frac {c}{2\,b}-\frac {a\,d}{2\,b^2}\right )+\frac {\ln \left (b\,x^2+a\right )\,\left (a^2\,d-a\,b\,c\right )}{2\,b^3}+\frac {d\,x^4}{4\,b} \]
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