Integrand size = 11, antiderivative size = 58 \[ \int \frac {x^3}{(a+b x)^4} \, dx=\frac {a^3}{3 b^4 (a+b x)^3}-\frac {3 a^2}{2 b^4 (a+b x)^2}+\frac {3 a}{b^4 (a+b x)}+\frac {\log (a+b x)}{b^4} \]
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Time = 0.02 (sec) , antiderivative size = 58, 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} \[ \int \frac {x^3}{(a+b x)^4} \, dx=\frac {a^3}{3 b^4 (a+b x)^3}-\frac {3 a^2}{2 b^4 (a+b x)^2}+\frac {3 a}{b^4 (a+b x)}+\frac {\log (a+b x)}{b^4} \]
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Rule 45
Rubi steps \begin{align*} \text {integral}& = \int \left (-\frac {a^3}{b^3 (a+b x)^4}+\frac {3 a^2}{b^3 (a+b x)^3}-\frac {3 a}{b^3 (a+b x)^2}+\frac {1}{b^3 (a+b x)}\right ) \, dx \\ & = \frac {a^3}{3 b^4 (a+b x)^3}-\frac {3 a^2}{2 b^4 (a+b x)^2}+\frac {3 a}{b^4 (a+b x)}+\frac {\log (a+b x)}{b^4} \\ \end{align*}
Time = 0.01 (sec) , antiderivative size = 44, normalized size of antiderivative = 0.76 \[ \int \frac {x^3}{(a+b x)^4} \, dx=\frac {\frac {a \left (11 a^2+27 a b x+18 b^2 x^2\right )}{(a+b x)^3}+6 \log (a+b x)}{6 b^4} \]
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Time = 0.18 (sec) , antiderivative size = 47, normalized size of antiderivative = 0.81
method | result | size |
norman | \(\frac {\frac {11 a^{3}}{6 b^{4}}+\frac {3 a \,x^{2}}{b^{2}}+\frac {9 a^{2} x}{2 b^{3}}}{\left (b x +a \right )^{3}}+\frac {\ln \left (b x +a \right )}{b^{4}}\) | \(47\) |
risch | \(\frac {\frac {11 a^{3}}{6 b^{4}}+\frac {3 a \,x^{2}}{b^{2}}+\frac {9 a^{2} x}{2 b^{3}}}{\left (b x +a \right )^{3}}+\frac {\ln \left (b x +a \right )}{b^{4}}\) | \(47\) |
default | \(\frac {a^{3}}{3 b^{4} \left (b x +a \right )^{3}}-\frac {3 a^{2}}{2 b^{4} \left (b x +a \right )^{2}}+\frac {3 a}{b^{4} \left (b x +a \right )}+\frac {\ln \left (b x +a \right )}{b^{4}}\) | \(55\) |
parallelrisch | \(\frac {6 b^{3} \ln \left (b x +a \right ) x^{3}+18 \ln \left (b x +a \right ) x^{2} a \,b^{2}+18 \ln \left (b x +a \right ) x \,a^{2} b +18 a \,b^{2} x^{2}+6 a^{3} \ln \left (b x +a \right )+27 a^{2} b x +11 a^{3}}{6 b^{4} \left (b x +a \right )^{3}}\) | \(88\) |
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none
Time = 0.22 (sec) , antiderivative size = 94, normalized size of antiderivative = 1.62 \[ \int \frac {x^3}{(a+b x)^4} \, dx=\frac {18 \, a b^{2} x^{2} + 27 \, a^{2} b x + 11 \, a^{3} + 6 \, {\left (b^{3} x^{3} + 3 \, a b^{2} x^{2} + 3 \, a^{2} b x + a^{3}\right )} \log \left (b x + a\right )}{6 \, {\left (b^{7} x^{3} + 3 \, a b^{6} x^{2} + 3 \, a^{2} b^{5} x + a^{3} b^{4}\right )}} \]
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Time = 0.15 (sec) , antiderivative size = 70, normalized size of antiderivative = 1.21 \[ \int \frac {x^3}{(a+b x)^4} \, dx=\frac {11 a^{3} + 27 a^{2} b x + 18 a b^{2} x^{2}}{6 a^{3} b^{4} + 18 a^{2} b^{5} x + 18 a b^{6} x^{2} + 6 b^{7} x^{3}} + \frac {\log {\left (a + b x \right )}}{b^{4}} \]
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none
Time = 0.20 (sec) , antiderivative size = 70, normalized size of antiderivative = 1.21 \[ \int \frac {x^3}{(a+b x)^4} \, dx=\frac {18 \, a b^{2} x^{2} + 27 \, a^{2} b x + 11 \, a^{3}}{6 \, {\left (b^{7} x^{3} + 3 \, a b^{6} x^{2} + 3 \, a^{2} b^{5} x + a^{3} b^{4}\right )}} + \frac {\log \left (b x + a\right )}{b^{4}} \]
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none
Time = 0.29 (sec) , antiderivative size = 46, normalized size of antiderivative = 0.79 \[ \int \frac {x^3}{(a+b x)^4} \, dx=\frac {\log \left ({\left | b x + a \right |}\right )}{b^{4}} + \frac {18 \, a b x^{2} + 27 \, a^{2} x + \frac {11 \, a^{3}}{b}}{6 \, {\left (b x + a\right )}^{3} b^{3}} \]
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Time = 0.08 (sec) , antiderivative size = 45, normalized size of antiderivative = 0.78 \[ \int \frac {x^3}{(a+b x)^4} \, dx=\frac {\ln \left (a+b\,x\right )+\frac {3\,a}{a+b\,x}-\frac {3\,a^2}{2\,{\left (a+b\,x\right )}^2}+\frac {a^3}{3\,{\left (a+b\,x\right )}^3}}{b^4} \]
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