Integrand size = 12, antiderivative size = 120 \[ \int x^2 \sqrt {\text {arccosh}(a x)} \, dx=\frac {1}{3} x^3 \sqrt {\text {arccosh}(a x)}-\frac {\sqrt {\pi } \text {erf}\left (\sqrt {\text {arccosh}(a x)}\right )}{16 a^3}-\frac {\sqrt {\frac {\pi }{3}} \text {erf}\left (\sqrt {3} \sqrt {\text {arccosh}(a x)}\right )}{48 a^3}-\frac {\sqrt {\pi } \text {erfi}\left (\sqrt {\text {arccosh}(a x)}\right )}{16 a^3}-\frac {\sqrt {\frac {\pi }{3}} \text {erfi}\left (\sqrt {3} \sqrt {\text {arccosh}(a x)}\right )}{48 a^3} \]
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Time = 0.29 (sec) , antiderivative size = 120, normalized size of antiderivative = 1.00, number of steps used = 14, number of rules used = 7, \(\frac {\text {number of rules}}{\text {integrand size}}\) = 0.583, Rules used = {5884, 5953, 3393, 3388, 2211, 2235, 2236} \[ \int x^2 \sqrt {\text {arccosh}(a x)} \, dx=-\frac {\sqrt {\pi } \text {erf}\left (\sqrt {\text {arccosh}(a x)}\right )}{16 a^3}-\frac {\sqrt {\frac {\pi }{3}} \text {erf}\left (\sqrt {3} \sqrt {\text {arccosh}(a x)}\right )}{48 a^3}-\frac {\sqrt {\pi } \text {erfi}\left (\sqrt {\text {arccosh}(a x)}\right )}{16 a^3}-\frac {\sqrt {\frac {\pi }{3}} \text {erfi}\left (\sqrt {3} \sqrt {\text {arccosh}(a x)}\right )}{48 a^3}+\frac {1}{3} x^3 \sqrt {\text {arccosh}(a x)} \]
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Rule 2211
Rule 2235
Rule 2236
Rule 3388
Rule 3393
Rule 5884
Rule 5953
Rubi steps \begin{align*} \text {integral}& = \frac {1}{3} x^3 \sqrt {\text {arccosh}(a x)}-\frac {1}{6} a \int \frac {x^3}{\sqrt {-1+a x} \sqrt {1+a x} \sqrt {\text {arccosh}(a x)}} \, dx \\ & = \frac {1}{3} x^3 \sqrt {\text {arccosh}(a x)}-\frac {\text {Subst}\left (\int \frac {\cosh ^3(x)}{\sqrt {x}} \, dx,x,\text {arccosh}(a x)\right )}{6 a^3} \\ & = \frac {1}{3} x^3 \sqrt {\text {arccosh}(a x)}-\frac {\text {Subst}\left (\int \left (\frac {3 \cosh (x)}{4 \sqrt {x}}+\frac {\cosh (3 x)}{4 \sqrt {x}}\right ) \, dx,x,\text {arccosh}(a x)\right )}{6 a^3} \\ & = \frac {1}{3} x^3 \sqrt {\text {arccosh}(a x)}-\frac {\text {Subst}\left (\int \frac {\cosh (3 x)}{\sqrt {x}} \, dx,x,\text {arccosh}(a x)\right )}{24 a^3}-\frac {\text {Subst}\left (\int \frac {\cosh (x)}{\sqrt {x}} \, dx,x,\text {arccosh}(a x)\right )}{8 a^3} \\ & = \frac {1}{3} x^3 \sqrt {\text {arccosh}(a x)}-\frac {\text {Subst}\left (\int \frac {e^{-3 x}}{\sqrt {x}} \, dx,x,\text {arccosh}(a x)\right )}{48 a^3}-\frac {\text {Subst}\left (\int \frac {e^{3 x}}{\sqrt {x}} \, dx,x,\text {arccosh}(a x)\right )}{48 a^3}-\frac {\text {Subst}\left (\int \frac {e^{-x}}{\sqrt {x}} \, dx,x,\text {arccosh}(a x)\right )}{16 a^3}-\frac {\text {Subst}\left (\int \frac {e^x}{\sqrt {x}} \, dx,x,\text {arccosh}(a x)\right )}{16 a^3} \\ & = \frac {1}{3} x^3 \sqrt {\text {arccosh}(a x)}-\frac {\text {Subst}\left (\int e^{-3 x^2} \, dx,x,\sqrt {\text {arccosh}(a x)}\right )}{24 a^3}-\frac {\text {Subst}\left (\int e^{3 x^2} \, dx,x,\sqrt {\text {arccosh}(a x)}\right )}{24 a^3}-\frac {\text {Subst}\left (\int e^{-x^2} \, dx,x,\sqrt {\text {arccosh}(a x)}\right )}{8 a^3}-\frac {\text {Subst}\left (\int e^{x^2} \, dx,x,\sqrt {\text {arccosh}(a x)}\right )}{8 a^3} \\ & = \frac {1}{3} x^3 \sqrt {\text {arccosh}(a x)}-\frac {\sqrt {\pi } \text {erf}\left (\sqrt {\text {arccosh}(a x)}\right )}{16 a^3}-\frac {\sqrt {\frac {\pi }{3}} \text {erf}\left (\sqrt {3} \sqrt {\text {arccosh}(a x)}\right )}{48 a^3}-\frac {\sqrt {\pi } \text {erfi}\left (\sqrt {\text {arccosh}(a x)}\right )}{16 a^3}-\frac {\sqrt {\frac {\pi }{3}} \text {erfi}\left (\sqrt {3} \sqrt {\text {arccosh}(a x)}\right )}{48 a^3} \\ \end{align*}
Time = 0.07 (sec) , antiderivative size = 100, normalized size of antiderivative = 0.83 \[ \int x^2 \sqrt {\text {arccosh}(a x)} \, dx=\frac {\sqrt {3} \sqrt {\text {arccosh}(a x)} \Gamma \left (\frac {3}{2},-3 \text {arccosh}(a x)\right )+9 \sqrt {\text {arccosh}(a x)} \Gamma \left (\frac {3}{2},-\text {arccosh}(a x)\right )+\sqrt {-\text {arccosh}(a x)} \left (9 \Gamma \left (\frac {3}{2},\text {arccosh}(a x)\right )+\sqrt {3} \Gamma \left (\frac {3}{2},3 \text {arccosh}(a x)\right )\right )}{72 a^3 \sqrt {-\text {arccosh}(a x)}} \]
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\[\int x^{2} \sqrt {\operatorname {arccosh}\left (a x \right )}d x\]
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Exception generated. \[ \int x^2 \sqrt {\text {arccosh}(a x)} \, dx=\text {Exception raised: TypeError} \]
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\[ \int x^2 \sqrt {\text {arccosh}(a x)} \, dx=\int x^{2} \sqrt {\operatorname {acosh}{\left (a x \right )}}\, dx \]
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\[ \int x^2 \sqrt {\text {arccosh}(a x)} \, dx=\int { x^{2} \sqrt {\operatorname {arcosh}\left (a x\right )} \,d x } \]
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\[ \int x^2 \sqrt {\text {arccosh}(a x)} \, dx=\int { x^{2} \sqrt {\operatorname {arcosh}\left (a x\right )} \,d x } \]
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Timed out. \[ \int x^2 \sqrt {\text {arccosh}(a x)} \, dx=\int x^2\,\sqrt {\mathrm {acosh}\left (a\,x\right )} \,d x \]
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