Optimal. Leaf size=42 \[ \frac{\log \left (\left (a+b x^4\right )^2+1\right )}{8 b}+\frac{\left (a+b x^4\right ) \cot ^{-1}\left (a+b x^4\right )}{4 b} \]
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Rubi [A] time = 0.0435711, antiderivative size = 42, normalized size of antiderivative = 1., number of steps used = 4, number of rules used = 4, integrand size = 12, \(\frac{\text{number of rules}}{\text{integrand size}}\) = 0.333, Rules used = {6715, 5040, 4847, 260} \[ \frac{\log \left (\left (a+b x^4\right )^2+1\right )}{8 b}+\frac{\left (a+b x^4\right ) \cot ^{-1}\left (a+b x^4\right )}{4 b} \]
Antiderivative was successfully verified.
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Rule 6715
Rule 5040
Rule 4847
Rule 260
Rubi steps
\begin{align*} \int x^3 \cot ^{-1}\left (a+b x^4\right ) \, dx &=\frac{1}{4} \operatorname{Subst}\left (\int \cot ^{-1}(a+b x) \, dx,x,x^4\right )\\ &=\frac{\operatorname{Subst}\left (\int \cot ^{-1}(x) \, dx,x,a+b x^4\right )}{4 b}\\ &=\frac{\left (a+b x^4\right ) \cot ^{-1}\left (a+b x^4\right )}{4 b}+\frac{\operatorname{Subst}\left (\int \frac{x}{1+x^2} \, dx,x,a+b x^4\right )}{4 b}\\ &=\frac{\left (a+b x^4\right ) \cot ^{-1}\left (a+b x^4\right )}{4 b}+\frac{\log \left (1+\left (a+b x^4\right )^2\right )}{8 b}\\ \end{align*}
Mathematica [A] time = 0.0160148, size = 37, normalized size = 0.88 \[ \frac{\log \left (\left (a+b x^4\right )^2+1\right )+2 \left (a+b x^4\right ) \cot ^{-1}\left (a+b x^4\right )}{8 b} \]
Antiderivative was successfully verified.
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Maple [A] time = 0.039, size = 46, normalized size = 1.1 \begin{align*}{\frac{{\rm arccot} \left (b{x}^{4}+a\right ){x}^{4}}{4}}+{\frac{{\rm arccot} \left (b{x}^{4}+a\right )a}{4\,b}}+{\frac{\ln \left ( 1+ \left ( b{x}^{4}+a \right ) ^{2} \right ) }{8\,b}} \end{align*}
Verification of antiderivative is not currently implemented for this CAS.
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Maxima [A] time = 0.973675, size = 47, normalized size = 1.12 \begin{align*} \frac{2 \,{\left (b x^{4} + a\right )} \operatorname{arccot}\left (b x^{4} + a\right ) + \log \left ({\left (b x^{4} + a\right )}^{2} + 1\right )}{8 \, b} \end{align*}
Verification of antiderivative is not currently implemented for this CAS.
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Fricas [A] time = 2.5196, size = 130, normalized size = 3.1 \begin{align*} \frac{2 \, b x^{4} \operatorname{arccot}\left (b x^{4} + a\right ) - 2 \, a \arctan \left (b x^{4} + a\right ) + \log \left (b^{2} x^{8} + 2 \, a b x^{4} + a^{2} + 1\right )}{8 \, b} \end{align*}
Verification of antiderivative is not currently implemented for this CAS.
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Sympy [A] time = 5.6283, size = 60, normalized size = 1.43 \begin{align*} \begin{cases} \frac{a \operatorname{acot}{\left (a + b x^{4} \right )}}{4 b} + \frac{x^{4} \operatorname{acot}{\left (a + b x^{4} \right )}}{4} + \frac{\log{\left (a^{2} + 2 a b x^{4} + b^{2} x^{8} + 1 \right )}}{8 b} & \text{for}\: b \neq 0 \\\frac{x^{4} \operatorname{acot}{\left (a \right )}}{4} & \text{otherwise} \end{cases} \end{align*}
Verification of antiderivative is not currently implemented for this CAS.
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Giac [A] time = 1.09646, size = 80, normalized size = 1.9 \begin{align*} \frac{1}{4} \, x^{4} \arctan \left (\frac{1}{b x^{4} + a}\right ) - \frac{1}{8} \, b{\left (\frac{2 \, a \arctan \left (b x^{4} + a\right )}{b^{2}} - \frac{\log \left (b^{2} x^{8} + 2 \, a b x^{4} + a^{2} + 1\right )}{b^{2}}\right )} \end{align*}
Verification of antiderivative is not currently implemented for this CAS.
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