Optimal. Leaf size=82 \[ -\frac {2 x^2 \sqrt {1-a^2 x^2} \cos ^{-1}(a x)}{9 a}-\frac {4 x}{9 a^2}-\frac {4 \sqrt {1-a^2 x^2} \cos ^{-1}(a x)}{9 a^3}+\frac {1}{3} x^3 \cos ^{-1}(a x)^2-\frac {2 x^3}{27} \]
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Rubi [A] time = 0.13, antiderivative size = 82, normalized size of antiderivative = 1.00, number of steps used = 5, number of rules used = 5, integrand size = 10, \(\frac {\text {number of rules}}{\text {integrand size}}\) = 0.500, Rules used = {4628, 4708, 4678, 8, 30} \[ -\frac {2 x^2 \sqrt {1-a^2 x^2} \cos ^{-1}(a x)}{9 a}-\frac {4 \sqrt {1-a^2 x^2} \cos ^{-1}(a x)}{9 a^3}-\frac {4 x}{9 a^2}+\frac {1}{3} x^3 \cos ^{-1}(a x)^2-\frac {2 x^3}{27} \]
Antiderivative was successfully verified.
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Rule 8
Rule 30
Rule 4628
Rule 4678
Rule 4708
Rubi steps
\begin {align*} \int x^2 \cos ^{-1}(a x)^2 \, dx &=\frac {1}{3} x^3 \cos ^{-1}(a x)^2+\frac {1}{3} (2 a) \int \frac {x^3 \cos ^{-1}(a x)}{\sqrt {1-a^2 x^2}} \, dx\\ &=-\frac {2 x^2 \sqrt {1-a^2 x^2} \cos ^{-1}(a x)}{9 a}+\frac {1}{3} x^3 \cos ^{-1}(a x)^2-\frac {2 \int x^2 \, dx}{9}+\frac {4 \int \frac {x \cos ^{-1}(a x)}{\sqrt {1-a^2 x^2}} \, dx}{9 a}\\ &=-\frac {2 x^3}{27}-\frac {4 \sqrt {1-a^2 x^2} \cos ^{-1}(a x)}{9 a^3}-\frac {2 x^2 \sqrt {1-a^2 x^2} \cos ^{-1}(a x)}{9 a}+\frac {1}{3} x^3 \cos ^{-1}(a x)^2-\frac {4 \int 1 \, dx}{9 a^2}\\ &=-\frac {4 x}{9 a^2}-\frac {2 x^3}{27}-\frac {4 \sqrt {1-a^2 x^2} \cos ^{-1}(a x)}{9 a^3}-\frac {2 x^2 \sqrt {1-a^2 x^2} \cos ^{-1}(a x)}{9 a}+\frac {1}{3} x^3 \cos ^{-1}(a x)^2\\ \end {align*}
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Mathematica [A] time = 0.06, size = 63, normalized size = 0.77 \[ -\frac {4 x}{9 a^2}-\frac {2 \sqrt {1-a^2 x^2} \left (a^2 x^2+2\right ) \cos ^{-1}(a x)}{9 a^3}+\frac {1}{3} x^3 \cos ^{-1}(a x)^2-\frac {2 x^3}{27} \]
Antiderivative was successfully verified.
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fricas [A] time = 0.45, size = 59, normalized size = 0.72 \[ \frac {9 \, a^{3} x^{3} \arccos \left (a x\right )^{2} - 2 \, a^{3} x^{3} - 6 \, {\left (a^{2} x^{2} + 2\right )} \sqrt {-a^{2} x^{2} + 1} \arccos \left (a x\right ) - 12 \, a x}{27 \, a^{3}} \]
Verification of antiderivative is not currently implemented for this CAS.
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giac [A] time = 0.19, size = 68, normalized size = 0.83 \[ \frac {1}{3} \, x^{3} \arccos \left (a x\right )^{2} - \frac {2}{27} \, x^{3} - \frac {2 \, \sqrt {-a^{2} x^{2} + 1} x^{2} \arccos \left (a x\right )}{9 \, a} - \frac {4 \, x}{9 \, a^{2}} - \frac {4 \, \sqrt {-a^{2} x^{2} + 1} \arccos \left (a x\right )}{9 \, a^{3}} \]
Verification of antiderivative is not currently implemented for this CAS.
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maple [A] time = 0.05, size = 59, normalized size = 0.72 \[ \frac {\frac {a^{3} x^{3} \arccos \left (a x \right )^{2}}{3}-\frac {2 \arccos \left (a x \right ) \left (a^{2} x^{2}+2\right ) \sqrt {-a^{2} x^{2}+1}}{9}-\frac {2 a^{3} x^{3}}{27}-\frac {4 a x}{9}}{a^{3}} \]
Verification of antiderivative is not currently implemented for this CAS.
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maxima [A] time = 0.52, size = 72, normalized size = 0.88 \[ \frac {1}{3} \, x^{3} \arccos \left (a x\right )^{2} - \frac {2}{9} \, a {\left (\frac {\sqrt {-a^{2} x^{2} + 1} x^{2}}{a^{2}} + \frac {2 \, \sqrt {-a^{2} x^{2} + 1}}{a^{4}}\right )} \arccos \left (a x\right ) - \frac {2 \, {\left (a^{2} x^{3} + 6 \, x\right )}}{27 \, a^{2}} \]
Verification of antiderivative is not currently implemented for this CAS.
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mupad [F] time = 0.00, size = -1, normalized size = -0.01 \[ \int x^2\,{\mathrm {acos}\left (a\,x\right )}^2 \,d x \]
Verification of antiderivative is not currently implemented for this CAS.
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sympy [A] time = 0.85, size = 83, normalized size = 1.01 \[ \begin {cases} \frac {x^{3} \operatorname {acos}^{2}{\left (a x \right )}}{3} - \frac {2 x^{3}}{27} - \frac {2 x^{2} \sqrt {- a^{2} x^{2} + 1} \operatorname {acos}{\left (a x \right )}}{9 a} - \frac {4 x}{9 a^{2}} - \frac {4 \sqrt {- a^{2} x^{2} + 1} \operatorname {acos}{\left (a x \right )}}{9 a^{3}} & \text {for}\: a \neq 0 \\\frac {\pi ^{2} x^{3}}{12} & \text {otherwise} \end {cases} \]
Verification of antiderivative is not currently implemented for this CAS.
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