Optimal. Leaf size=113 \[ \frac{3^{-n-1} \cosh ^{-1}(a x)^n \left (-\cosh ^{-1}(a x)\right )^{-n} \text{Gamma}\left (n+1,-3 \cosh ^{-1}(a x)\right )}{8 a^3}+\frac{\cosh ^{-1}(a x)^n \left (-\cosh ^{-1}(a x)\right )^{-n} \text{Gamma}\left (n+1,-\cosh ^{-1}(a x)\right )}{8 a^3}+\frac{\text{Gamma}\left (n+1,\cosh ^{-1}(a x)\right )}{8 a^3}+\frac{3^{-n-1} \text{Gamma}\left (n+1,3 \cosh ^{-1}(a x)\right )}{8 a^3} \]
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Rubi [A] time = 0.182161, antiderivative size = 113, normalized size of antiderivative = 1., number of steps used = 9, number of rules used = 4, integrand size = 10, \(\frac{\text{number of rules}}{\text{integrand size}}\) = 0.4, Rules used = {5670, 5448, 3308, 2181} \[ \frac{3^{-n-1} \cosh ^{-1}(a x)^n \left (-\cosh ^{-1}(a x)\right )^{-n} \text{Gamma}\left (n+1,-3 \cosh ^{-1}(a x)\right )}{8 a^3}+\frac{\cosh ^{-1}(a x)^n \left (-\cosh ^{-1}(a x)\right )^{-n} \text{Gamma}\left (n+1,-\cosh ^{-1}(a x)\right )}{8 a^3}+\frac{\text{Gamma}\left (n+1,\cosh ^{-1}(a x)\right )}{8 a^3}+\frac{3^{-n-1} \text{Gamma}\left (n+1,3 \cosh ^{-1}(a x)\right )}{8 a^3} \]
Antiderivative was successfully verified.
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Rule 5670
Rule 5448
Rule 3308
Rule 2181
Rubi steps
\begin{align*} \int x^2 \cosh ^{-1}(a x)^n \, dx &=\frac{\operatorname{Subst}\left (\int x^n \cosh ^2(x) \sinh (x) \, dx,x,\cosh ^{-1}(a x)\right )}{a^3}\\ &=\frac{\operatorname{Subst}\left (\int \left (\frac{1}{4} x^n \sinh (x)+\frac{1}{4} x^n \sinh (3 x)\right ) \, dx,x,\cosh ^{-1}(a x)\right )}{a^3}\\ &=\frac{\operatorname{Subst}\left (\int x^n \sinh (x) \, dx,x,\cosh ^{-1}(a x)\right )}{4 a^3}+\frac{\operatorname{Subst}\left (\int x^n \sinh (3 x) \, dx,x,\cosh ^{-1}(a x)\right )}{4 a^3}\\ &=-\frac{\operatorname{Subst}\left (\int e^{-3 x} x^n \, dx,x,\cosh ^{-1}(a x)\right )}{8 a^3}-\frac{\operatorname{Subst}\left (\int e^{-x} x^n \, dx,x,\cosh ^{-1}(a x)\right )}{8 a^3}+\frac{\operatorname{Subst}\left (\int e^x x^n \, dx,x,\cosh ^{-1}(a x)\right )}{8 a^3}+\frac{\operatorname{Subst}\left (\int e^{3 x} x^n \, dx,x,\cosh ^{-1}(a x)\right )}{8 a^3}\\ &=\frac{3^{-1-n} \left (-\cosh ^{-1}(a x)\right )^{-n} \cosh ^{-1}(a x)^n \Gamma \left (1+n,-3 \cosh ^{-1}(a x)\right )}{8 a^3}+\frac{\left (-\cosh ^{-1}(a x)\right )^{-n} \cosh ^{-1}(a x)^n \Gamma \left (1+n,-\cosh ^{-1}(a x)\right )}{8 a^3}+\frac{\Gamma \left (1+n,\cosh ^{-1}(a x)\right )}{8 a^3}+\frac{3^{-1-n} \Gamma \left (1+n,3 \cosh ^{-1}(a x)\right )}{8 a^3}\\ \end{align*}
Mathematica [A] time = 0.110834, size = 95, normalized size = 0.84 \[ \frac{3^{-n-1} \cosh ^{-1}(a x)^n \left (-\cosh ^{-1}(a x)\right )^{-n} \text{Gamma}\left (n+1,-3 \cosh ^{-1}(a x)\right )+\cosh ^{-1}(a x)^n \left (-\cosh ^{-1}(a x)\right )^{-n} \text{Gamma}\left (n+1,-\cosh ^{-1}(a x)\right )+\text{Gamma}\left (n+1,\cosh ^{-1}(a x)\right )+3^{-n-1} \text{Gamma}\left (n+1,3 \cosh ^{-1}(a x)\right )}{8 a^3} \]
Antiderivative was successfully verified.
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Maple [F] time = 0.092, size = 0, normalized size = 0. \begin{align*} \int{x}^{2} \left ({\rm arccosh} \left (ax\right ) \right ) ^{n}\, dx \end{align*}
Verification of antiderivative is not currently implemented for this CAS.
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Maxima [F] time = 0., size = 0, normalized size = 0. \begin{align*} \int x^{2} \operatorname{arcosh}\left (a x\right )^{n}\,{d x} \end{align*}
Verification of antiderivative is not currently implemented for this CAS.
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Fricas [F] time = 0., size = 0, normalized size = 0. \begin{align*}{\rm integral}\left (x^{2} \operatorname{arcosh}\left (a x\right )^{n}, x\right ) \end{align*}
Verification of antiderivative is not currently implemented for this CAS.
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Sympy [F] time = 0., size = 0, normalized size = 0. \begin{align*} \int x^{2} \operatorname{acosh}^{n}{\left (a x \right )}\, dx \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*} \mathit{sage}_{0} x \end{align*}
Verification of antiderivative is not currently implemented for this CAS.
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