Integrand size = 11, antiderivative size = 41 \[ \int \frac {x^2}{(a+b x)^3} \, dx=-\frac {a^2}{2 b^3 (a+b x)^2}+\frac {2 a}{b^3 (a+b x)}+\frac {\log (a+b x)}{b^3} \]
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Time = 0.01 (sec) , antiderivative size = 41, normalized size of antiderivative = 1.00, number of steps used = 2, number of rules used = 1, \(\frac {\text {number of rules}}{\text {integrand size}}\) = 0.091, Rules used = {45} \[ \int \frac {x^2}{(a+b x)^3} \, dx=-\frac {a^2}{2 b^3 (a+b x)^2}+\frac {2 a}{b^3 (a+b x)}+\frac {\log (a+b x)}{b^3} \]
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Rule 45
Rubi steps \begin{align*} \text {integral}& = \int \left (\frac {a^2}{b^2 (a+b x)^3}-\frac {2 a}{b^2 (a+b x)^2}+\frac {1}{b^2 (a+b x)}\right ) \, dx \\ & = -\frac {a^2}{2 b^3 (a+b x)^2}+\frac {2 a}{b^3 (a+b x)}+\frac {\log (a+b x)}{b^3} \\ \end{align*}
Time = 0.01 (sec) , antiderivative size = 33, normalized size of antiderivative = 0.80 \[ \int \frac {x^2}{(a+b x)^3} \, dx=\frac {\frac {a (3 a+4 b x)}{(a+b x)^2}+2 \log (a+b x)}{2 b^3} \]
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Time = 0.18 (sec) , antiderivative size = 36, normalized size of antiderivative = 0.88
method | result | size |
norman | \(\frac {\frac {3 a^{2}}{2 b^{3}}+\frac {2 a x}{b^{2}}}{\left (b x +a \right )^{2}}+\frac {\ln \left (b x +a \right )}{b^{3}}\) | \(36\) |
risch | \(\frac {\frac {3 a^{2}}{2 b^{3}}+\frac {2 a x}{b^{2}}}{\left (b x +a \right )^{2}}+\frac {\ln \left (b x +a \right )}{b^{3}}\) | \(36\) |
default | \(-\frac {a^{2}}{2 b^{3} \left (b x +a \right )^{2}}+\frac {2 a}{b^{3} \left (b x +a \right )}+\frac {\ln \left (b x +a \right )}{b^{3}}\) | \(40\) |
parallelrisch | \(\frac {2 b^{2} \ln \left (b x +a \right ) x^{2}+4 \ln \left (b x +a \right ) x a b +2 a^{2} \ln \left (b x +a \right )+4 a b x +3 a^{2}}{2 b^{3} \left (b x +a \right )^{2}}\) | \(60\) |
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none
Time = 0.21 (sec) , antiderivative size = 61, normalized size of antiderivative = 1.49 \[ \int \frac {x^2}{(a+b x)^3} \, dx=\frac {4 \, a b x + 3 \, a^{2} + 2 \, {\left (b^{2} x^{2} + 2 \, a b x + a^{2}\right )} \log \left (b x + a\right )}{2 \, {\left (b^{5} x^{2} + 2 \, a b^{4} x + a^{2} b^{3}\right )}} \]
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Time = 0.10 (sec) , antiderivative size = 46, normalized size of antiderivative = 1.12 \[ \int \frac {x^2}{(a+b x)^3} \, dx=\frac {3 a^{2} + 4 a b x}{2 a^{2} b^{3} + 4 a b^{4} x + 2 b^{5} x^{2}} + \frac {\log {\left (a + b x \right )}}{b^{3}} \]
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none
Time = 0.22 (sec) , antiderivative size = 48, normalized size of antiderivative = 1.17 \[ \int \frac {x^2}{(a+b x)^3} \, dx=\frac {4 \, a b x + 3 \, a^{2}}{2 \, {\left (b^{5} x^{2} + 2 \, a b^{4} x + a^{2} b^{3}\right )}} + \frac {\log \left (b x + a\right )}{b^{3}} \]
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Time = 0.29 (sec) , antiderivative size = 37, normalized size of antiderivative = 0.90 \[ \int \frac {x^2}{(a+b x)^3} \, dx=\frac {\log \left ({\left | b x + a \right |}\right )}{b^{3}} + \frac {4 \, a x + \frac {3 \, a^{2}}{b}}{2 \, {\left (b x + a\right )}^{2} b^{2}} \]
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Time = 0.11 (sec) , antiderivative size = 46, normalized size of antiderivative = 1.12 \[ \int \frac {x^2}{(a+b x)^3} \, dx=\frac {\ln \left (a+b\,x\right )}{b^3}+\frac {\frac {3\,a^2}{2\,b^3}+\frac {2\,a\,x}{b^2}}{a^2+2\,a\,b\,x+b^2\,x^2} \]
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