Integrand size = 13, antiderivative size = 43 \[ \int \frac {\left (a+\frac {b}{x}\right )^3}{x^5} \, dx=-\frac {b^3}{7 x^7}-\frac {a b^2}{2 x^6}-\frac {3 a^2 b}{5 x^5}-\frac {a^3}{4 x^4} \]
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Time = 0.01 (sec) , antiderivative size = 43, normalized size of antiderivative = 1.00, number of steps used = 3, number of rules used = 2, \(\frac {\text {number of rules}}{\text {integrand size}}\) = 0.154, Rules used = {269, 45} \[ \int \frac {\left (a+\frac {b}{x}\right )^3}{x^5} \, dx=-\frac {a^3}{4 x^4}-\frac {3 a^2 b}{5 x^5}-\frac {a b^2}{2 x^6}-\frac {b^3}{7 x^7} \]
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Rule 45
Rule 269
Rubi steps \begin{align*} \text {integral}& = \int \frac {(b+a x)^3}{x^8} \, dx \\ & = \int \left (\frac {b^3}{x^8}+\frac {3 a b^2}{x^7}+\frac {3 a^2 b}{x^6}+\frac {a^3}{x^5}\right ) \, dx \\ & = -\frac {b^3}{7 x^7}-\frac {a b^2}{2 x^6}-\frac {3 a^2 b}{5 x^5}-\frac {a^3}{4 x^4} \\ \end{align*}
Time = 0.01 (sec) , antiderivative size = 43, normalized size of antiderivative = 1.00 \[ \int \frac {\left (a+\frac {b}{x}\right )^3}{x^5} \, dx=-\frac {b^3}{7 x^7}-\frac {a b^2}{2 x^6}-\frac {3 a^2 b}{5 x^5}-\frac {a^3}{4 x^4} \]
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Time = 0.02 (sec) , antiderivative size = 35, normalized size of antiderivative = 0.81
method | result | size |
norman | \(\frac {-\frac {1}{4} a^{3} x^{3}-\frac {3}{5} a^{2} b \,x^{2}-\frac {1}{2} a \,b^{2} x -\frac {1}{7} b^{3}}{x^{7}}\) | \(35\) |
risch | \(\frac {-\frac {1}{4} a^{3} x^{3}-\frac {3}{5} a^{2} b \,x^{2}-\frac {1}{2} a \,b^{2} x -\frac {1}{7} b^{3}}{x^{7}}\) | \(35\) |
gosper | \(-\frac {35 a^{3} x^{3}+84 a^{2} b \,x^{2}+70 a \,b^{2} x +20 b^{3}}{140 x^{7}}\) | \(36\) |
default | \(-\frac {b^{3}}{7 x^{7}}-\frac {a \,b^{2}}{2 x^{6}}-\frac {3 a^{2} b}{5 x^{5}}-\frac {a^{3}}{4 x^{4}}\) | \(36\) |
parallelrisch | \(\frac {-35 a^{3} x^{3}-84 a^{2} b \,x^{2}-70 a \,b^{2} x -20 b^{3}}{140 x^{7}}\) | \(36\) |
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Time = 0.25 (sec) , antiderivative size = 35, normalized size of antiderivative = 0.81 \[ \int \frac {\left (a+\frac {b}{x}\right )^3}{x^5} \, dx=-\frac {35 \, a^{3} x^{3} + 84 \, a^{2} b x^{2} + 70 \, a b^{2} x + 20 \, b^{3}}{140 \, x^{7}} \]
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Time = 0.13 (sec) , antiderivative size = 37, normalized size of antiderivative = 0.86 \[ \int \frac {\left (a+\frac {b}{x}\right )^3}{x^5} \, dx=\frac {- 35 a^{3} x^{3} - 84 a^{2} b x^{2} - 70 a b^{2} x - 20 b^{3}}{140 x^{7}} \]
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Time = 0.21 (sec) , antiderivative size = 35, normalized size of antiderivative = 0.81 \[ \int \frac {\left (a+\frac {b}{x}\right )^3}{x^5} \, dx=-\frac {35 \, a^{3} x^{3} + 84 \, a^{2} b x^{2} + 70 \, a b^{2} x + 20 \, b^{3}}{140 \, x^{7}} \]
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Time = 0.26 (sec) , antiderivative size = 35, normalized size of antiderivative = 0.81 \[ \int \frac {\left (a+\frac {b}{x}\right )^3}{x^5} \, dx=-\frac {35 \, a^{3} x^{3} + 84 \, a^{2} b x^{2} + 70 \, a b^{2} x + 20 \, b^{3}}{140 \, x^{7}} \]
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Time = 0.04 (sec) , antiderivative size = 35, normalized size of antiderivative = 0.81 \[ \int \frac {\left (a+\frac {b}{x}\right )^3}{x^5} \, dx=-\frac {\frac {a^3\,x^3}{4}+\frac {3\,a^2\,b\,x^2}{5}+\frac {a\,b^2\,x}{2}+\frac {b^3}{7}}{x^7} \]
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