Optimal. Leaf size=47 \[ -\frac {1}{4} a x \sqrt {1-\frac {x^2}{a^2}}+\frac {1}{4} a^2 \sin ^{-1}\left (\frac {x}{a}\right )+\frac {1}{2} x^2 \cos ^{-1}\left (\frac {x}{a}\right ) \]
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Rubi [A] time = 0.02, antiderivative size = 47, normalized size of antiderivative = 1.00, number of steps used = 4, number of rules used = 4, integrand size = 8, \(\frac {\text {number of rules}}{\text {integrand size}}\) = 0.500, Rules used = {5264, 4628, 321, 216} \[ -\frac {1}{4} a x \sqrt {1-\frac {x^2}{a^2}}+\frac {1}{4} a^2 \sin ^{-1}\left (\frac {x}{a}\right )+\frac {1}{2} x^2 \cos ^{-1}\left (\frac {x}{a}\right ) \]
Antiderivative was successfully verified.
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Rule 216
Rule 321
Rule 4628
Rule 5264
Rubi steps
\begin {align*} \int x \sec ^{-1}\left (\frac {a}{x}\right ) \, dx &=\int x \cos ^{-1}\left (\frac {x}{a}\right ) \, dx\\ &=\frac {1}{2} x^2 \cos ^{-1}\left (\frac {x}{a}\right )+\frac {\int \frac {x^2}{\sqrt {1-\frac {x^2}{a^2}}} \, dx}{2 a}\\ &=-\frac {1}{4} a x \sqrt {1-\frac {x^2}{a^2}}+\frac {1}{2} x^2 \cos ^{-1}\left (\frac {x}{a}\right )+\frac {1}{4} a \int \frac {1}{\sqrt {1-\frac {x^2}{a^2}}} \, dx\\ &=-\frac {1}{4} a x \sqrt {1-\frac {x^2}{a^2}}+\frac {1}{2} x^2 \cos ^{-1}\left (\frac {x}{a}\right )+\frac {1}{4} a^2 \sin ^{-1}\left (\frac {x}{a}\right )\\ \end {align*}
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Mathematica [A] time = 0.02, size = 44, normalized size = 0.94 \[ \frac {1}{4} \left (-a x \sqrt {1-\frac {x^2}{a^2}}+a^2 \sin ^{-1}\left (\frac {x}{a}\right )+2 x^2 \sec ^{-1}\left (\frac {a}{x}\right )\right ) \]
Antiderivative was successfully verified.
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fricas [A] time = 0.88, size = 38, normalized size = 0.81 \[ -\frac {1}{4} \, x^{2} \sqrt {\frac {a^{2} - x^{2}}{x^{2}}} - \frac {1}{4} \, {\left (a^{2} - 2 \, x^{2}\right )} \operatorname {arcsec}\left (\frac {a}{x}\right ) \]
Verification of antiderivative is not currently implemented for this CAS.
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giac [A] time = 0.12, size = 39, normalized size = 0.83 \[ -\frac {1}{4} \, a^{2} \arccos \left (\frac {x}{a}\right ) + \frac {1}{2} \, x^{2} \arccos \left (\frac {x}{a}\right ) - \frac {1}{4} \, a x \sqrt {-\frac {x^{2}}{a^{2}} + 1} \]
Verification of antiderivative is not currently implemented for this CAS.
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maple [B] time = 0.07, size = 93, normalized size = 1.98 \[ \frac {x^{2} \mathrm {arcsec}\left (\frac {a}{x}\right )}{2}+\frac {a \sqrt {-1+\frac {a^{2}}{x^{2}}}\, x \arctan \left (\frac {1}{\sqrt {-1+\frac {a^{2}}{x^{2}}}}\right )}{4 \sqrt {\frac {\left (-1+\frac {a^{2}}{x^{2}}\right ) x^{2}}{a^{2}}}}-\frac {\left (-1+\frac {a^{2}}{x^{2}}\right ) x^{3}}{4 a \sqrt {\frac {\left (-1+\frac {a^{2}}{x^{2}}\right ) x^{2}}{a^{2}}}} \]
Verification of antiderivative is not currently implemented for this CAS.
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maxima [A] time = 0.43, size = 46, normalized size = 0.98 \[ \frac {1}{2} \, x^{2} \operatorname {arcsec}\left (\frac {a}{x}\right ) + \frac {a^{3} \arcsin \left (\frac {x}{a}\right ) - a^{2} x \sqrt {-\frac {x^{2}}{a^{2}} + 1}}{4 \, a} \]
Verification of antiderivative is not currently implemented for this CAS.
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mupad [B] time = 0.63, size = 38, normalized size = 0.81 \[ \frac {a^2\,\mathrm {acos}\left (\frac {x}{a}\right )\,\left (\frac {2\,x^2}{a^2}-1\right )}{4}-\frac {a\,x\,\sqrt {1-\frac {x^2}{a^2}}}{4} \]
Verification of antiderivative is not currently implemented for this CAS.
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sympy [A] time = 0.22, size = 41, normalized size = 0.87 \[ \begin {cases} - \frac {a^{2} \operatorname {asec}{\left (\frac {a}{x} \right )}}{4} - \frac {a x \sqrt {1 - \frac {x^{2}}{a^{2}}}}{4} + \frac {x^{2} \operatorname {asec}{\left (\frac {a}{x} \right )}}{2} & \text {for}\: a \neq 0 \\\tilde {\infty } x^{2} & \text {otherwise} \end {cases} \]
Verification of antiderivative is not currently implemented for this CAS.
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