Optimal. Leaf size=26 \[ -\sqrt{4 x-x^2}-2 \sin ^{-1}\left (1-\frac{x}{2}\right ) \]
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Rubi [A] time = 0.010801, antiderivative size = 26, normalized size of antiderivative = 1., number of steps used = 3, number of rules used = 3, integrand size = 15, \(\frac{\text{number of rules}}{\text{integrand size}}\) = 0.2, Rules used = {640, 619, 216} \[ -\sqrt{4 x-x^2}-2 \sin ^{-1}\left (1-\frac{x}{2}\right ) \]
Antiderivative was successfully verified.
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Rule 640
Rule 619
Rule 216
Rubi steps
\begin{align*} \int \frac{x}{\sqrt{4 x-x^2}} \, dx &=-\sqrt{4 x-x^2}+2 \int \frac{1}{\sqrt{4 x-x^2}} \, dx\\ &=-\sqrt{4 x-x^2}-\frac{1}{2} \operatorname{Subst}\left (\int \frac{1}{\sqrt{1-\frac{x^2}{16}}} \, dx,x,4-2 x\right )\\ &=-\sqrt{4 x-x^2}-2 \sin ^{-1}\left (1-\frac{x}{2}\right )\\ \end{align*}
Mathematica [A] time = 0.0298684, size = 27, normalized size = 1.04 \[ -\sqrt{-(x-4) x}-4 \sin ^{-1}\left (\sqrt{1-\frac{x}{4}}\right ) \]
Antiderivative was successfully verified.
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Maple [A] time = 0.044, size = 23, normalized size = 0.9 \begin{align*} 2\,\arcsin \left ( -1+x/2 \right ) -\sqrt{-{x}^{2}+4\,x} \end{align*}
Verification of antiderivative is not currently implemented for this CAS.
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Maxima [A] time = 1.69455, size = 30, normalized size = 1.15 \begin{align*} -\sqrt{-x^{2} + 4 \, x} - 2 \, \arcsin \left (-\frac{1}{2} \, x + 1\right ) \end{align*}
Verification of antiderivative is not currently implemented for this CAS.
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Fricas [A] time = 1.9748, size = 68, normalized size = 2.62 \begin{align*} -\sqrt{-x^{2} + 4 \, x} - 4 \, \arctan \left (\frac{\sqrt{-x^{2} + 4 \, x}}{x}\right ) \end{align*}
Verification of antiderivative is not currently implemented for this CAS.
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Sympy [F] time = 0., size = 0, normalized size = 0. \begin{align*} \int \frac{x}{\sqrt{- x \left (x - 4\right )}}\, dx \end{align*}
Verification of antiderivative is not currently implemented for this CAS.
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Giac [A] time = 1.15947, size = 30, normalized size = 1.15 \begin{align*} -\sqrt{-x^{2} + 4 \, x} + 2 \, \arcsin \left (\frac{1}{2} \, x - 1\right ) \end{align*}
Verification of antiderivative is not currently implemented for this CAS.
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