Integrand size = 6, antiderivative size = 31 \[ \int x \cot ^{-1}(a x) \, dx=\frac {x}{2 a}+\frac {1}{2} x^2 \cot ^{-1}(a x)-\frac {\arctan (a x)}{2 a^2} \]
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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, \(\frac {\text {number of rules}}{\text {integrand size}}\) = 0.500, Rules used = {4947, 327, 209} \[ \int x \cot ^{-1}(a x) \, dx=-\frac {\arctan (a x)}{2 a^2}+\frac {1}{2} x^2 \cot ^{-1}(a x)+\frac {x}{2 a} \]
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Rule 209
Rule 327
Rule 4947
Rubi steps \begin{align*} \text {integral}& = \frac {1}{2} x^2 \cot ^{-1}(a x)+\frac {1}{2} a \int \frac {x^2}{1+a^2 x^2} \, dx \\ & = \frac {x}{2 a}+\frac {1}{2} x^2 \cot ^{-1}(a x)-\frac {\int \frac {1}{1+a^2 x^2} \, dx}{2 a} \\ & = \frac {x}{2 a}+\frac {1}{2} x^2 \cot ^{-1}(a x)-\frac {\arctan (a x)}{2 a^2} \\ \end{align*}
Time = 0.00 (sec) , antiderivative size = 31, normalized size of antiderivative = 1.00 \[ \int x \cot ^{-1}(a x) \, dx=\frac {x}{2 a}+\frac {1}{2} x^2 \cot ^{-1}(a x)-\frac {\arctan (a x)}{2 a^2} \]
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Time = 0.15 (sec) , antiderivative size = 25, normalized size of antiderivative = 0.81
method | result | size |
parallelrisch | \(\frac {\operatorname {arccot}\left (a x \right ) a^{2} x^{2}+a x +\operatorname {arccot}\left (a x \right )}{2 a^{2}}\) | \(25\) |
derivativedivides | \(\frac {\frac {\operatorname {arccot}\left (a x \right ) a^{2} x^{2}}{2}+\frac {a x}{2}-\frac {\arctan \left (a x \right )}{2}}{a^{2}}\) | \(28\) |
default | \(\frac {\frac {\operatorname {arccot}\left (a x \right ) a^{2} x^{2}}{2}+\frac {a x}{2}-\frac {\arctan \left (a x \right )}{2}}{a^{2}}\) | \(28\) |
parts | \(\frac {x^{2} \operatorname {arccot}\left (a x \right )}{2}+\frac {a \left (\frac {x}{a^{2}}-\frac {\arctan \left (a x \right )}{a^{3}}\right )}{2}\) | \(29\) |
risch | \(\frac {i x^{2} \ln \left (i a x +1\right )}{4}-\frac {i x^{2} \ln \left (-i a x +1\right )}{4}+\frac {\pi \,x^{2}}{4}+\frac {x}{2 a}-\frac {\arctan \left (a x \right )}{2 a^{2}}\) | \(51\) |
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Time = 0.30 (sec) , antiderivative size = 23, normalized size of antiderivative = 0.74 \[ \int x \cot ^{-1}(a x) \, dx=\frac {a x + {\left (a^{2} x^{2} + 1\right )} \operatorname {arccot}\left (a x\right )}{2 \, a^{2}} \]
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Time = 0.17 (sec) , antiderivative size = 31, normalized size of antiderivative = 1.00 \[ \int x \cot ^{-1}(a x) \, dx=\begin {cases} \frac {x^{2} \operatorname {acot}{\left (a x \right )}}{2} + \frac {x}{2 a} + \frac {\operatorname {acot}{\left (a x \right )}}{2 a^{2}} & \text {for}\: a \neq 0 \\\frac {\pi x^{2}}{4} & \text {otherwise} \end {cases} \]
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Time = 0.27 (sec) , antiderivative size = 28, normalized size of antiderivative = 0.90 \[ \int x \cot ^{-1}(a x) \, dx=\frac {1}{2} \, x^{2} \operatorname {arccot}\left (a x\right ) + \frac {1}{2} \, a {\left (\frac {x}{a^{2}} - \frac {\arctan \left (a x\right )}{a^{3}}\right )} \]
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Time = 0.29 (sec) , antiderivative size = 36, normalized size of antiderivative = 1.16 \[ \int x \cot ^{-1}(a x) \, dx=\frac {1}{2} \, {\left (\frac {x^{2} \arctan \left (\frac {1}{a x}\right )}{a} + \frac {x}{a^{2}} + \frac {\arctan \left (\frac {1}{a x}\right )}{a^{3}}\right )} a \]
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Time = 0.80 (sec) , antiderivative size = 39, normalized size of antiderivative = 1.26 \[ \int x \cot ^{-1}(a x) \, dx=\left \{\begin {array}{cl} \frac {\pi \,x^2}{4} & \text {\ if\ \ }a=0\\ \frac {x-\frac {\mathrm {atan}\left (a\,x\right )}{a}}{2\,a}+\frac {x^2\,\mathrm {acot}\left (a\,x\right )}{2} & \text {\ if\ \ }a\neq 0 \end {array}\right . \]
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