Integrand size = 8, antiderivative size = 75 \[ \int x^4 \arccos (a x) \, dx=-\frac {\sqrt {1-a^2 x^2}}{5 a^5}+\frac {2 \left (1-a^2 x^2\right )^{3/2}}{15 a^5}-\frac {\left (1-a^2 x^2\right )^{5/2}}{25 a^5}+\frac {1}{5} x^5 \arccos (a x) \]
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Time = 0.03 (sec) , antiderivative size = 75, normalized size of antiderivative = 1.00, number of steps used = 4, number of rules used = 3, \(\frac {\text {number of rules}}{\text {integrand size}}\) = 0.375, Rules used = {4724, 272, 45} \[ \int x^4 \arccos (a x) \, dx=-\frac {\left (1-a^2 x^2\right )^{5/2}}{25 a^5}+\frac {2 \left (1-a^2 x^2\right )^{3/2}}{15 a^5}-\frac {\sqrt {1-a^2 x^2}}{5 a^5}+\frac {1}{5} x^5 \arccos (a x) \]
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Rule 45
Rule 272
Rule 4724
Rubi steps \begin{align*} \text {integral}& = \frac {1}{5} x^5 \arccos (a x)+\frac {1}{5} a \int \frac {x^5}{\sqrt {1-a^2 x^2}} \, dx \\ & = \frac {1}{5} x^5 \arccos (a x)+\frac {1}{10} a \text {Subst}\left (\int \frac {x^2}{\sqrt {1-a^2 x}} \, dx,x,x^2\right ) \\ & = \frac {1}{5} x^5 \arccos (a x)+\frac {1}{10} a \text {Subst}\left (\int \left (\frac {1}{a^4 \sqrt {1-a^2 x}}-\frac {2 \sqrt {1-a^2 x}}{a^4}+\frac {\left (1-a^2 x\right )^{3/2}}{a^4}\right ) \, dx,x,x^2\right ) \\ & = -\frac {\sqrt {1-a^2 x^2}}{5 a^5}+\frac {2 \left (1-a^2 x^2\right )^{3/2}}{15 a^5}-\frac {\left (1-a^2 x^2\right )^{5/2}}{25 a^5}+\frac {1}{5} x^5 \arccos (a x) \\ \end{align*}
Time = 0.03 (sec) , antiderivative size = 51, normalized size of antiderivative = 0.68 \[ \int x^4 \arccos (a x) \, dx=-\frac {\sqrt {1-a^2 x^2} \left (8+4 a^2 x^2+3 a^4 x^4\right )}{75 a^5}+\frac {1}{5} x^5 \arccos (a x) \]
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Time = 0.09 (sec) , antiderivative size = 72, normalized size of antiderivative = 0.96
method | result | size |
derivativedivides | \(\frac {\frac {a^{5} x^{5} \arccos \left (a x \right )}{5}-\frac {a^{4} x^{4} \sqrt {-a^{2} x^{2}+1}}{25}-\frac {4 a^{2} x^{2} \sqrt {-a^{2} x^{2}+1}}{75}-\frac {8 \sqrt {-a^{2} x^{2}+1}}{75}}{a^{5}}\) | \(72\) |
default | \(\frac {\frac {a^{5} x^{5} \arccos \left (a x \right )}{5}-\frac {a^{4} x^{4} \sqrt {-a^{2} x^{2}+1}}{25}-\frac {4 a^{2} x^{2} \sqrt {-a^{2} x^{2}+1}}{75}-\frac {8 \sqrt {-a^{2} x^{2}+1}}{75}}{a^{5}}\) | \(72\) |
parts | \(\frac {x^{5} \arccos \left (a x \right )}{5}+\frac {a \left (-\frac {x^{4} \sqrt {-a^{2} x^{2}+1}}{5 a^{2}}+\frac {-\frac {4 x^{2} \sqrt {-a^{2} x^{2}+1}}{15 a^{2}}-\frac {8 \sqrt {-a^{2} x^{2}+1}}{15 a^{4}}}{a^{2}}\right )}{5}\) | \(78\) |
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Time = 0.28 (sec) , antiderivative size = 50, normalized size of antiderivative = 0.67 \[ \int x^4 \arccos (a x) \, dx=\frac {15 \, a^{5} x^{5} \arccos \left (a x\right ) - {\left (3 \, a^{4} x^{4} + 4 \, a^{2} x^{2} + 8\right )} \sqrt {-a^{2} x^{2} + 1}}{75 \, a^{5}} \]
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Time = 0.34 (sec) , antiderivative size = 75, normalized size of antiderivative = 1.00 \[ \int x^4 \arccos (a x) \, dx=\begin {cases} \frac {x^{5} \operatorname {acos}{\left (a x \right )}}{5} - \frac {x^{4} \sqrt {- a^{2} x^{2} + 1}}{25 a} - \frac {4 x^{2} \sqrt {- a^{2} x^{2} + 1}}{75 a^{3}} - \frac {8 \sqrt {- a^{2} x^{2} + 1}}{75 a^{5}} & \text {for}\: a \neq 0 \\\frac {\pi x^{5}}{10} & \text {otherwise} \end {cases} \]
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Time = 0.30 (sec) , antiderivative size = 71, normalized size of antiderivative = 0.95 \[ \int x^4 \arccos (a x) \, dx=\frac {1}{5} \, x^{5} \arccos \left (a x\right ) - \frac {1}{75} \, {\left (\frac {3 \, \sqrt {-a^{2} x^{2} + 1} x^{4}}{a^{2}} + \frac {4 \, \sqrt {-a^{2} x^{2} + 1} x^{2}}{a^{4}} + \frac {8 \, \sqrt {-a^{2} x^{2} + 1}}{a^{6}}\right )} a \]
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Time = 0.27 (sec) , antiderivative size = 67, normalized size of antiderivative = 0.89 \[ \int x^4 \arccos (a x) \, dx=\frac {1}{5} \, x^{5} \arccos \left (a x\right ) - \frac {\sqrt {-a^{2} x^{2} + 1} x^{4}}{25 \, a} - \frac {4 \, \sqrt {-a^{2} x^{2} + 1} x^{2}}{75 \, a^{3}} - \frac {8 \, \sqrt {-a^{2} x^{2} + 1}}{75 \, a^{5}} \]
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Timed out. \[ \int x^4 \arccos (a x) \, dx=\int x^4\,\mathrm {acos}\left (a\,x\right ) \,d x \]
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