Integrand size = 8, antiderivative size = 41 \[ \int \frac {\cot ^{-1}(a x)}{x^5} \, dx=\frac {a}{12 x^3}-\frac {a^3}{4 x}-\frac {\cot ^{-1}(a x)}{4 x^4}-\frac {1}{4} a^4 \arctan (a x) \]
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Time = 0.01 (sec) , antiderivative size = 41, normalized size of antiderivative = 1.00, number of steps used = 4, number of rules used = 3, \(\frac {\text {number of rules}}{\text {integrand size}}\) = 0.375, Rules used = {4947, 331, 209} \[ \int \frac {\cot ^{-1}(a x)}{x^5} \, dx=-\frac {1}{4} a^4 \arctan (a x)-\frac {a^3}{4 x}-\frac {\cot ^{-1}(a x)}{4 x^4}+\frac {a}{12 x^3} \]
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Rule 209
Rule 331
Rule 4947
Rubi steps \begin{align*} \text {integral}& = -\frac {\cot ^{-1}(a x)}{4 x^4}-\frac {1}{4} a \int \frac {1}{x^4 \left (1+a^2 x^2\right )} \, dx \\ & = \frac {a}{12 x^3}-\frac {\cot ^{-1}(a x)}{4 x^4}+\frac {1}{4} a^3 \int \frac {1}{x^2 \left (1+a^2 x^2\right )} \, dx \\ & = \frac {a}{12 x^3}-\frac {a^3}{4 x}-\frac {\cot ^{-1}(a x)}{4 x^4}-\frac {1}{4} a^5 \int \frac {1}{1+a^2 x^2} \, dx \\ & = \frac {a}{12 x^3}-\frac {a^3}{4 x}-\frac {\cot ^{-1}(a x)}{4 x^4}-\frac {1}{4} a^4 \arctan (a x) \\ \end{align*}
Result contains higher order function than in optimal. Order 5 vs. order 3 in optimal.
Time = 0.00 (sec) , antiderivative size = 36, normalized size of antiderivative = 0.88 \[ \int \frac {\cot ^{-1}(a x)}{x^5} \, dx=-\frac {\cot ^{-1}(a x)}{4 x^4}+\frac {a \operatorname {Hypergeometric2F1}\left (-\frac {3}{2},1,-\frac {1}{2},-a^2 x^2\right )}{12 x^3} \]
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Time = 0.17 (sec) , antiderivative size = 35, normalized size of antiderivative = 0.85
method | result | size |
parts | \(-\frac {\operatorname {arccot}\left (a x \right )}{4 x^{4}}-\frac {a \left (-\frac {1}{3 x^{3}}+\frac {a^{2}}{x}+a^{3} \arctan \left (a x \right )\right )}{4}\) | \(35\) |
parallelrisch | \(\frac {3 a^{4} x^{4} \operatorname {arccot}\left (a x \right )-3 a^{3} x^{3}+a x -3 \,\operatorname {arccot}\left (a x \right )}{12 x^{4}}\) | \(36\) |
derivativedivides | \(a^{4} \left (-\frac {\operatorname {arccot}\left (a x \right )}{4 a^{4} x^{4}}-\frac {\arctan \left (a x \right )}{4}+\frac {1}{12 a^{3} x^{3}}-\frac {1}{4 a x}\right )\) | \(40\) |
default | \(a^{4} \left (-\frac {\operatorname {arccot}\left (a x \right )}{4 a^{4} x^{4}}-\frac {\arctan \left (a x \right )}{4}+\frac {1}{12 a^{3} x^{3}}-\frac {1}{4 a x}\right )\) | \(40\) |
risch | \(-\frac {i \ln \left (i a x +1\right )}{8 x^{4}}-\frac {-3 i a^{4} \ln \left (-a x +i\right ) x^{4}+3 i a^{4} \ln \left (-a x -i\right ) x^{4}+6 a^{3} x^{3}-3 i \ln \left (-i a x +1\right )-2 a x +3 \pi }{24 x^{4}}\) | \(82\) |
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Time = 0.25 (sec) , antiderivative size = 33, normalized size of antiderivative = 0.80 \[ \int \frac {\cot ^{-1}(a x)}{x^5} \, dx=-\frac {3 \, a^{3} x^{3} - a x - 3 \, {\left (a^{4} x^{4} - 1\right )} \operatorname {arccot}\left (a x\right )}{12 \, x^{4}} \]
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Time = 0.22 (sec) , antiderivative size = 32, normalized size of antiderivative = 0.78 \[ \int \frac {\cot ^{-1}(a x)}{x^5} \, dx=\frac {a^{4} \operatorname {acot}{\left (a x \right )}}{4} - \frac {a^{3}}{4 x} + \frac {a}{12 x^{3}} - \frac {\operatorname {acot}{\left (a x \right )}}{4 x^{4}} \]
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Time = 0.27 (sec) , antiderivative size = 37, normalized size of antiderivative = 0.90 \[ \int \frac {\cot ^{-1}(a x)}{x^5} \, dx=-\frac {1}{12} \, {\left (3 \, a^{3} \arctan \left (a x\right ) + \frac {3 \, a^{2} x^{2} - 1}{x^{3}}\right )} a - \frac {\operatorname {arccot}\left (a x\right )}{4 \, x^{4}} \]
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Time = 0.27 (sec) , antiderivative size = 51, normalized size of antiderivative = 1.24 \[ \int \frac {\cot ^{-1}(a x)}{x^5} \, dx=-\frac {1}{12} \, {\left (a^{3} {\left (\frac {3}{a x} - \frac {1}{a^{3} x^{3}} - 3 \, \arctan \left (\frac {1}{a x}\right )\right )} + \frac {3 \, \arctan \left (\frac {1}{a x}\right )}{a x^{4}}\right )} a \]
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Time = 0.84 (sec) , antiderivative size = 47, normalized size of antiderivative = 1.15 \[ \int \frac {\cot ^{-1}(a x)}{x^5} \, dx=\left \{\begin {array}{cl} -\frac {\pi }{8\,x^4} & \text {\ if\ \ }a=0\\ -\frac {a^4\,\mathrm {atan}\left (a\,x\right )}{4}-\frac {\frac {\mathrm {acot}\left (a\,x\right )}{4}-\frac {a\,x}{12}+\frac {a^3\,x^3}{4}}{x^4} & \text {\ if\ \ }a\neq 0 \end {array}\right . \]
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