Optimal. Leaf size=33 \[ -\frac{1}{2} \sqrt{2 x-x^2} (1-x)-\frac{1}{2} \sin ^{-1}(1-x) \]
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Rubi [A] time = 0.0076645, antiderivative size = 33, normalized size of antiderivative = 1., number of steps used = 3, number of rules used = 3, integrand size = 13, \(\frac{\text{number of rules}}{\text{integrand size}}\) = 0.231, Rules used = {612, 619, 216} \[ -\frac{1}{2} \sqrt{2 x-x^2} (1-x)-\frac{1}{2} \sin ^{-1}(1-x) \]
Antiderivative was successfully verified.
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Rule 612
Rule 619
Rule 216
Rubi steps
\begin{align*} \int \sqrt{2 x-x^2} \, dx &=-\frac{1}{2} (1-x) \sqrt{2 x-x^2}+\frac{1}{2} \int \frac{1}{\sqrt{2 x-x^2}} \, dx\\ &=-\frac{1}{2} (1-x) \sqrt{2 x-x^2}-\frac{1}{4} \operatorname{Subst}\left (\int \frac{1}{\sqrt{1-\frac{x^2}{4}}} \, dx,x,2-2 x\right )\\ &=-\frac{1}{2} (1-x) \sqrt{2 x-x^2}-\frac{1}{2} \sin ^{-1}(1-x)\\ \end{align*}
Mathematica [A] time = 0.0391544, size = 32, normalized size = 0.97 \[ \frac{1}{2} (x-1) \sqrt{-(x-2) x}-\sin ^{-1}\left (\sqrt{1-\frac{x}{2}}\right ) \]
Antiderivative was successfully verified.
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Maple [A] time = 0.003, size = 26, normalized size = 0.8 \begin{align*} -{\frac{-2\,x+2}{4}\sqrt{-{x}^{2}+2\,x}}+{\frac{\arcsin \left ( -1+x \right ) }{2}} \end{align*}
Verification of antiderivative is not currently implemented for this CAS.
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Maxima [A] time = 1.39716, size = 49, normalized size = 1.48 \begin{align*} \frac{1}{2} \, \sqrt{-x^{2} + 2 \, x} x - \frac{1}{2} \, \sqrt{-x^{2} + 2 \, x} - \frac{1}{2} \, \arcsin \left (-x + 1\right ) \end{align*}
Verification of antiderivative is not currently implemented for this CAS.
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Fricas [A] time = 2.16882, size = 80, normalized size = 2.42 \begin{align*} \frac{1}{2} \, \sqrt{-x^{2} + 2 \, x}{\left (x - 1\right )} - \arctan \left (\frac{\sqrt{-x^{2} + 2 \, 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 \sqrt{- x^{2} + 2 x}\, dx \end{align*}
Verification of antiderivative is not currently implemented for this CAS.
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Giac [A] time = 1.057, size = 31, normalized size = 0.94 \begin{align*} \frac{1}{2} \, \sqrt{-x^{2} + 2 \, x}{\left (x - 1\right )} + \frac{1}{2} \, \arcsin \left (x - 1\right ) \end{align*}
Verification of antiderivative is not currently implemented for this CAS.
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