Integrand size = 8, antiderivative size = 31 \[ \int \frac {\cot ^{-1}(a x)}{x^3} \, dx=\frac {a}{2 x}-\frac {\cot ^{-1}(a x)}{2 x^2}+\frac {1}{2} a^2 \arctan (a x) \]
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Time = 0.01 (sec) , antiderivative size = 31, normalized size of antiderivative = 1.00, number of steps used = 3, number of rules used = 3, \(\frac {\text {number of rules}}{\text {integrand size}}\) = 0.375, Rules used = {4947, 331, 209} \[ \int \frac {\cot ^{-1}(a x)}{x^3} \, dx=\frac {1}{2} a^2 \arctan (a x)-\frac {\cot ^{-1}(a x)}{2 x^2}+\frac {a}{2 x} \]
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Rule 209
Rule 331
Rule 4947
Rubi steps \begin{align*} \text {integral}& = -\frac {\cot ^{-1}(a x)}{2 x^2}-\frac {1}{2} a \int \frac {1}{x^2 \left (1+a^2 x^2\right )} \, dx \\ & = \frac {a}{2 x}-\frac {\cot ^{-1}(a x)}{2 x^2}+\frac {1}{2} a^3 \int \frac {1}{1+a^2 x^2} \, dx \\ & = \frac {a}{2 x}-\frac {\cot ^{-1}(a x)}{2 x^2}+\frac {1}{2} a^2 \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 = 1.16 \[ \int \frac {\cot ^{-1}(a x)}{x^3} \, dx=-\frac {\cot ^{-1}(a x)}{2 x^2}+\frac {a \operatorname {Hypergeometric2F1}\left (-\frac {1}{2},1,\frac {1}{2},-a^2 x^2\right )}{2 x} \]
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Time = 0.15 (sec) , antiderivative size = 26, normalized size of antiderivative = 0.84
method | result | size |
parallelrisch | \(-\frac {\operatorname {arccot}\left (a x \right ) a^{2} x^{2}-a x +\operatorname {arccot}\left (a x \right )}{2 x^{2}}\) | \(26\) |
parts | \(-\frac {\operatorname {arccot}\left (a x \right )}{2 x^{2}}-\frac {a \left (-\frac {1}{x}-a \arctan \left (a x \right )\right )}{2}\) | \(27\) |
derivativedivides | \(a^{2} \left (-\frac {\operatorname {arccot}\left (a x \right )}{2 a^{2} x^{2}}+\frac {\arctan \left (a x \right )}{2}+\frac {1}{2 a x}\right )\) | \(32\) |
default | \(a^{2} \left (-\frac {\operatorname {arccot}\left (a x \right )}{2 a^{2} x^{2}}+\frac {\arctan \left (a x \right )}{2}+\frac {1}{2 a x}\right )\) | \(32\) |
risch | \(-\frac {i \ln \left (i a x +1\right )}{4 x^{2}}-\frac {-i a^{2} \ln \left (-a x -i\right ) x^{2}+i a^{2} \ln \left (-a x +i\right ) x^{2}-i \ln \left (-i a x +1\right )-2 a x +\pi }{4 x^{2}}\) | \(72\) |
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Time = 0.25 (sec) , antiderivative size = 24, normalized size of antiderivative = 0.77 \[ \int \frac {\cot ^{-1}(a x)}{x^3} \, dx=\frac {a x - {\left (a^{2} x^{2} + 1\right )} \operatorname {arccot}\left (a x\right )}{2 \, x^{2}} \]
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Time = 0.18 (sec) , antiderivative size = 24, normalized size of antiderivative = 0.77 \[ \int \frac {\cot ^{-1}(a x)}{x^3} \, dx=- \frac {a^{2} \operatorname {acot}{\left (a x \right )}}{2} + \frac {a}{2 x} - \frac {\operatorname {acot}{\left (a x \right )}}{2 x^{2}} \]
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Time = 0.30 (sec) , antiderivative size = 23, normalized size of antiderivative = 0.74 \[ \int \frac {\cot ^{-1}(a x)}{x^3} \, dx=\frac {1}{2} \, {\left (a \arctan \left (a x\right ) + \frac {1}{x}\right )} a - \frac {\operatorname {arccot}\left (a x\right )}{2 \, x^{2}} \]
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Time = 0.28 (sec) , antiderivative size = 40, normalized size of antiderivative = 1.29 \[ \int \frac {\cot ^{-1}(a x)}{x^3} \, dx=\frac {1}{2} \, {\left (a {\left (\frac {1}{a x} - \arctan \left (\frac {1}{a x}\right )\right )} - \frac {\arctan \left (\frac {1}{a x}\right )}{a x^{2}}\right )} a \]
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Time = 0.81 (sec) , antiderivative size = 44, normalized size of antiderivative = 1.42 \[ \int \frac {\cot ^{-1}(a x)}{x^3} \, dx=\left \{\begin {array}{cl} -\frac {\pi }{4\,x^2} & \text {\ if\ \ }a=0\\ \frac {a^3\,\mathrm {atan}\left (a\,x\right )+\frac {a^2}{x}}{2\,a}-\frac {\mathrm {acot}\left (a\,x\right )}{2\,x^2} & \text {\ if\ \ }a\neq 0 \end {array}\right . \]
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