Optimal. Leaf size=54 \[ -\frac {9}{32} \sqrt {4 x^2-9} x-\frac {81}{64} \tanh ^{-1}\left (\frac {2 x}{\sqrt {4 x^2-9}}\right )+\frac {1}{4} \sqrt {4 x^2-9} x^3 \]
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Rubi [A] time = 0.01, antiderivative size = 54, normalized size of antiderivative = 1.00, number of steps used = 4, number of rules used = 4, integrand size = 15, \(\frac {\text {number of rules}}{\text {integrand size}}\) = 0.267, Rules used = {279, 321, 217, 206} \[ \frac {1}{4} \sqrt {4 x^2-9} x^3-\frac {9}{32} \sqrt {4 x^2-9} x-\frac {81}{64} \tanh ^{-1}\left (\frac {2 x}{\sqrt {4 x^2-9}}\right ) \]
Antiderivative was successfully verified.
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Rule 206
Rule 217
Rule 279
Rule 321
Rubi steps
\begin {align*} \int x^2 \sqrt {-9+4 x^2} \, dx &=\frac {1}{4} x^3 \sqrt {-9+4 x^2}-\frac {9}{4} \int \frac {x^2}{\sqrt {-9+4 x^2}} \, dx\\ &=-\frac {9}{32} x \sqrt {-9+4 x^2}+\frac {1}{4} x^3 \sqrt {-9+4 x^2}-\frac {81}{32} \int \frac {1}{\sqrt {-9+4 x^2}} \, dx\\ &=-\frac {9}{32} x \sqrt {-9+4 x^2}+\frac {1}{4} x^3 \sqrt {-9+4 x^2}-\frac {81}{32} \operatorname {Subst}\left (\int \frac {1}{1-4 x^2} \, dx,x,\frac {x}{\sqrt {-9+4 x^2}}\right )\\ &=-\frac {9}{32} x \sqrt {-9+4 x^2}+\frac {1}{4} x^3 \sqrt {-9+4 x^2}-\frac {81}{64} \tanh ^{-1}\left (\frac {2 x}{\sqrt {-9+4 x^2}}\right )\\ \end {align*}
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Mathematica [A] time = 0.01, size = 46, normalized size = 0.85 \[ \sqrt {4 x^2-9} \left (\frac {x^3}{4}-\frac {9 x}{32}\right )-\frac {81}{64} \log \left (\sqrt {4 x^2-9}+2 x\right ) \]
Antiderivative was successfully verified.
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fricas [A] time = 0.85, size = 37, normalized size = 0.69 \[ \frac {1}{32} \, {\left (8 \, x^{3} - 9 \, x\right )} \sqrt {4 \, x^{2} - 9} + \frac {81}{64} \, \log \left (-2 \, x + \sqrt {4 \, x^{2} - 9}\right ) \]
Verification of antiderivative is not currently implemented for this CAS.
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giac [A] time = 1.16, size = 37, normalized size = 0.69 \[ \frac {1}{32} \, {\left (8 \, x^{2} - 9\right )} \sqrt {4 \, x^{2} - 9} x + \frac {81}{64} \, \log \left ({\left | -2 \, x + \sqrt {4 \, x^{2} - 9} \right |}\right ) \]
Verification of antiderivative is not currently implemented for this CAS.
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maple [A] time = 0.01, size = 47, normalized size = 0.87 \[ \frac {\left (4 x^{2}-9\right )^{\frac {3}{2}} x}{16}+\frac {9 \sqrt {4 x^{2}-9}\, x}{32}-\frac {81 \sqrt {4}\, \ln \left (\sqrt {4}\, x +\sqrt {4 x^{2}-9}\right )}{128} \]
Verification of antiderivative is not currently implemented for this CAS.
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maxima [A] time = 2.89, size = 43, normalized size = 0.80 \[ \frac {1}{16} \, {\left (4 \, x^{2} - 9\right )}^{\frac {3}{2}} x + \frac {9}{32} \, \sqrt {4 \, x^{2} - 9} x - \frac {81}{64} \, \log \left (8 \, x + 4 \, \sqrt {4 \, x^{2} - 9}\right ) \]
Verification of antiderivative is not currently implemented for this CAS.
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mupad [F] time = 0.00, size = -1, normalized size = -0.02 \[ \int x^2\,\sqrt {4\,x^2-9} \,d x \]
Verification of antiderivative is not currently implemented for this CAS.
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sympy [A] time = 2.80, size = 124, normalized size = 2.30 \[ \begin {cases} \frac {x^{5}}{\sqrt {4 x^{2} - 9}} - \frac {27 x^{3}}{8 \sqrt {4 x^{2} - 9}} + \frac {81 x}{32 \sqrt {4 x^{2} - 9}} - \frac {81 \operatorname {acosh}{\left (\frac {2 x}{3} \right )}}{64} & \text {for}\: \frac {4 \left |{x^{2}}\right |}{9} > 1 \\- \frac {i x^{5}}{\sqrt {9 - 4 x^{2}}} + \frac {27 i x^{3}}{8 \sqrt {9 - 4 x^{2}}} - \frac {81 i x}{32 \sqrt {9 - 4 x^{2}}} + \frac {81 i \operatorname {asin}{\left (\frac {2 x}{3} \right )}}{64} & \text {otherwise} \end {cases} \]
Verification of antiderivative is not currently implemented for this CAS.
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