Optimal. Leaf size=36 \[ \frac{1}{2} (x+2) \sqrt{-x^2-4 x+5}-\frac{9}{2} \sin ^{-1}\left (\frac{1}{3} (-x-2)\right ) \]
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Rubi [A] time = 0.0102789, antiderivative size = 36, normalized size of antiderivative = 1., number of steps used = 3, number of rules used = 3, integrand size = 14, \(\frac{\text{number of rules}}{\text{integrand size}}\) = 0.214, Rules used = {612, 619, 216} \[ \frac{1}{2} (x+2) \sqrt{-x^2-4 x+5}-\frac{9}{2} \sin ^{-1}\left (\frac{1}{3} (-x-2)\right ) \]
Antiderivative was successfully verified.
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Rule 612
Rule 619
Rule 216
Rubi steps
\begin{align*} \int \sqrt{5-4 x-x^2} \, dx &=\frac{1}{2} (2+x) \sqrt{5-4 x-x^2}+\frac{9}{2} \int \frac{1}{\sqrt{5-4 x-x^2}} \, dx\\ &=\frac{1}{2} (2+x) \sqrt{5-4 x-x^2}-\frac{3}{4} \operatorname{Subst}\left (\int \frac{1}{\sqrt{1-\frac{x^2}{36}}} \, dx,x,-4-2 x\right )\\ &=\frac{1}{2} (2+x) \sqrt{5-4 x-x^2}-\frac{9}{2} \sin ^{-1}\left (\frac{1}{3} (-2-x)\right )\\ \end{align*}
Mathematica [A] time = 0.015808, size = 33, normalized size = 0.92 \[ \frac{1}{2} \left (\sqrt{-x^2-4 x+5} (x+2)+9 \sin ^{-1}\left (\frac{x+2}{3}\right )\right ) \]
Antiderivative was successfully verified.
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Maple [A] time = 0.003, size = 29, normalized size = 0.8 \begin{align*} -{\frac{-2\,x-4}{4}\sqrt{-{x}^{2}-4\,x+5}}+{\frac{9}{2}\arcsin \left ({\frac{2}{3}}+{\frac{x}{3}} \right ) } \end{align*}
Verification of antiderivative is not currently implemented for this CAS.
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Maxima [A] time = 1.43099, size = 49, normalized size = 1.36 \begin{align*} \frac{1}{2} \, \sqrt{-x^{2} - 4 \, x + 5} x + \sqrt{-x^{2} - 4 \, x + 5} - \frac{9}{2} \, \arcsin \left (-\frac{1}{3} \, x - \frac{2}{3}\right ) \end{align*}
Verification of antiderivative is not currently implemented for this CAS.
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Fricas [A] time = 2.05362, size = 126, normalized size = 3.5 \begin{align*} \frac{1}{2} \, \sqrt{-x^{2} - 4 \, x + 5}{\left (x + 2\right )} - \frac{9}{2} \, \arctan \left (\frac{\sqrt{-x^{2} - 4 \, x + 5}{\left (x + 2\right )}}{x^{2} + 4 \, x - 5}\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} - 4 x + 5}\, dx \end{align*}
Verification of antiderivative is not currently implemented for this CAS.
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Giac [A] time = 1.06128, size = 35, normalized size = 0.97 \begin{align*} \frac{1}{2} \, \sqrt{-x^{2} - 4 \, x + 5}{\left (x + 2\right )} + \frac{9}{2} \, \arcsin \left (\frac{1}{3} \, x + \frac{2}{3}\right ) \end{align*}
Verification of antiderivative is not currently implemented for this CAS.
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