Optimal. Leaf size=39 \[ -\frac{1}{2} \log \left (x^2+1\right )-\frac{\tan ^{-1}(x)^2}{2 x^2}+\log (x)-\frac{1}{2} \tan ^{-1}(x)^2-\frac{\tan ^{-1}(x)}{x} \]
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Rubi [A] time = 0.069604, antiderivative size = 39, normalized size of antiderivative = 1., number of steps used = 8, number of rules used = 7, integrand size = 8, \(\frac{\text{number of rules}}{\text{integrand size}}\) = 0.875, Rules used = {4852, 4918, 266, 36, 29, 31, 4884} \[ -\frac{1}{2} \log \left (x^2+1\right )-\frac{\tan ^{-1}(x)^2}{2 x^2}+\log (x)-\frac{1}{2} \tan ^{-1}(x)^2-\frac{\tan ^{-1}(x)}{x} \]
Antiderivative was successfully verified.
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Rule 4852
Rule 4918
Rule 266
Rule 36
Rule 29
Rule 31
Rule 4884
Rubi steps
\begin{align*} \int \frac{\tan ^{-1}(x)^2}{x^3} \, dx &=-\frac{\tan ^{-1}(x)^2}{2 x^2}+\int \frac{\tan ^{-1}(x)}{x^2 \left (1+x^2\right )} \, dx\\ &=-\frac{\tan ^{-1}(x)^2}{2 x^2}+\int \frac{\tan ^{-1}(x)}{x^2} \, dx-\int \frac{\tan ^{-1}(x)}{1+x^2} \, dx\\ &=-\frac{\tan ^{-1}(x)}{x}-\frac{1}{2} \tan ^{-1}(x)^2-\frac{\tan ^{-1}(x)^2}{2 x^2}+\int \frac{1}{x \left (1+x^2\right )} \, dx\\ &=-\frac{\tan ^{-1}(x)}{x}-\frac{1}{2} \tan ^{-1}(x)^2-\frac{\tan ^{-1}(x)^2}{2 x^2}+\frac{1}{2} \operatorname{Subst}\left (\int \frac{1}{x (1+x)} \, dx,x,x^2\right )\\ &=-\frac{\tan ^{-1}(x)}{x}-\frac{1}{2} \tan ^{-1}(x)^2-\frac{\tan ^{-1}(x)^2}{2 x^2}+\frac{1}{2} \operatorname{Subst}\left (\int \frac{1}{x} \, dx,x,x^2\right )-\frac{1}{2} \operatorname{Subst}\left (\int \frac{1}{1+x} \, dx,x,x^2\right )\\ &=-\frac{\tan ^{-1}(x)}{x}-\frac{1}{2} \tan ^{-1}(x)^2-\frac{\tan ^{-1}(x)^2}{2 x^2}+\log (x)-\frac{1}{2} \log \left (1+x^2\right )\\ \end{align*}
Mathematica [A] time = 0.0194049, size = 38, normalized size = 0.97 \[ -\frac{1}{2} \log \left (x^2+1\right )+\frac{\left (-x^2-1\right ) \tan ^{-1}(x)^2}{2 x^2}+\log (x)-\frac{\tan ^{-1}(x)}{x} \]
Antiderivative was successfully verified.
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Maple [A] time = 0.001, size = 34, normalized size = 0.9 \begin{align*} -{\frac{\arctan \left ( x \right ) }{x}}-{\frac{ \left ( \arctan \left ( x \right ) \right ) ^{2}}{2}}-{\frac{ \left ( \arctan \left ( x \right ) \right ) ^{2}}{2\,{x}^{2}}}+\ln \left ( x \right ) -{\frac{\ln \left ({x}^{2}+1 \right ) }{2}} \end{align*}
Verification of antiderivative is not currently implemented for this CAS.
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Maxima [A] time = 1.42613, size = 49, normalized size = 1.26 \begin{align*} -{\left (\frac{1}{x} + \arctan \left (x\right )\right )} \arctan \left (x\right ) + \frac{1}{2} \, \arctan \left (x\right )^{2} - \frac{\arctan \left (x\right )^{2}}{2 \, x^{2}} - \frac{1}{2} \, \log \left (x^{2} + 1\right ) + \log \left (x\right ) \end{align*}
Verification of antiderivative is not currently implemented for this CAS.
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Fricas [A] time = 2.50901, size = 113, normalized size = 2.9 \begin{align*} -\frac{{\left (x^{2} + 1\right )} \arctan \left (x\right )^{2} + x^{2} \log \left (x^{2} + 1\right ) - 2 \, x^{2} \log \left (x\right ) + 2 \, x \arctan \left (x\right )}{2 \, x^{2}} \end{align*}
Verification of antiderivative is not currently implemented for this CAS.
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Sympy [A] time = 0.547456, size = 32, normalized size = 0.82 \begin{align*} \log{\left (x \right )} - \frac{\log{\left (x^{2} + 1 \right )}}{2} - \frac{\operatorname{atan}^{2}{\left (x \right )}}{2} - \frac{\operatorname{atan}{\left (x \right )}}{x} - \frac{\operatorname{atan}^{2}{\left (x \right )}}{2 x^{2}} \end{align*}
Verification of antiderivative is not currently implemented for this CAS.
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Giac [F] time = 0., size = 0, normalized size = 0. \begin{align*} \int \frac{\arctan \left (x\right )^{2}}{x^{3}}\,{d x} \end{align*}
Verification of antiderivative is not currently implemented for this CAS.
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