Optimal. Leaf size=27 \[ -\frac{1}{2} \sqrt{1-x^2} (2-x)-\frac{1}{2} \sin ^{-1}(x) \]
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Rubi [A] time = 0.007999, antiderivative size = 27, normalized size of antiderivative = 1., number of steps used = 2, number of rules used = 2, integrand size = 18, \(\frac{\text{number of rules}}{\text{integrand size}}\) = 0.111, Rules used = {780, 216} \[ -\frac{1}{2} \sqrt{1-x^2} (2-x)-\frac{1}{2} \sin ^{-1}(x) \]
Antiderivative was successfully verified.
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Rule 780
Rule 216
Rubi steps
\begin{align*} \int \frac{(1-x) x}{\sqrt{1-x^2}} \, dx &=-\frac{1}{2} (2-x) \sqrt{1-x^2}-\frac{1}{2} \int \frac{1}{\sqrt{1-x^2}} \, dx\\ &=-\frac{1}{2} (2-x) \sqrt{1-x^2}-\frac{1}{2} \sin ^{-1}(x)\\ \end{align*}
Mathematica [A] time = 0.0145519, size = 24, normalized size = 0.89 \[ \frac{1}{2} \left ((x-2) \sqrt{1-x^2}-\sin ^{-1}(x)\right ) \]
Antiderivative was successfully verified.
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Maple [A] time = 0.007, size = 29, normalized size = 1.1 \begin{align*}{\frac{x}{2}\sqrt{-{x}^{2}+1}}-{\frac{\arcsin \left ( x \right ) }{2}}-\sqrt{-{x}^{2}+1} \end{align*}
Verification of antiderivative is not currently implemented for this CAS.
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Maxima [A] time = 1.85078, size = 38, normalized size = 1.41 \begin{align*} \frac{1}{2} \, \sqrt{-x^{2} + 1} x - \sqrt{-x^{2} + 1} - \frac{1}{2} \, \arcsin \left (x\right ) \end{align*}
Verification of antiderivative is not currently implemented for this CAS.
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Fricas [A] time = 1.4484, size = 82, normalized size = 3.04 \begin{align*} \frac{1}{2} \, \sqrt{-x^{2} + 1}{\left (x - 2\right )} + \arctan \left (\frac{\sqrt{-x^{2} + 1} - 1}{x}\right ) \end{align*}
Verification of antiderivative is not currently implemented for this CAS.
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Sympy [A] time = 0.205776, size = 24, normalized size = 0.89 \begin{align*} \frac{x \sqrt{1 - x^{2}}}{2} - \sqrt{1 - x^{2}} - \frac{\operatorname{asin}{\left (x \right )}}{2} \end{align*}
Verification of antiderivative is not currently implemented for this CAS.
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Giac [A] time = 1.18072, size = 26, normalized size = 0.96 \begin{align*} \frac{1}{2} \, \sqrt{-x^{2} + 1}{\left (x - 2\right )} - \frac{1}{2} \, \arcsin \left (x\right ) \end{align*}
Verification of antiderivative is not currently implemented for this CAS.
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