Optimal. Leaf size=16 \[ -\log \left (\sqrt {4-x^2}+1\right ) \]
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Rubi [A] time = 0.05, antiderivative size = 16, normalized size of antiderivative = 1.00, number of steps used = 3, number of rules used = 2, integrand size = 22, \(\frac {\text {number of rules}}{\text {integrand size}}\) = 0.091, Rules used = {2155, 31} \[ -\log \left (\sqrt {4-x^2}+1\right ) \]
Antiderivative was successfully verified.
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Rule 31
Rule 2155
Rubi steps
\begin {align*} \int \frac {x}{4-x^2+\sqrt {4-x^2}} \, dx &=\frac {1}{2} \operatorname {Subst}\left (\int \frac {1}{4+\sqrt {4-x}-x} \, dx,x,x^2\right )\\ &=-\operatorname {Subst}\left (\int \frac {1}{1+x} \, dx,x,\sqrt {4-x^2}\right )\\ &=-\log \left (1+\sqrt {4-x^2}\right )\\ \end {align*}
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Mathematica [A] time = 0.03, size = 16, normalized size = 1.00 \[ -\log \left (\sqrt {4-x^2}+1\right ) \]
Antiderivative was successfully verified.
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fricas [B] time = 0.40, size = 55, normalized size = 3.44 \[ -\frac {1}{2} \, \log \left (x^{2} - 3\right ) + \frac {1}{2} \, \log \left (-\frac {x^{2} + 3 \, \sqrt {-x^{2} + 4} - 6}{x^{2}}\right ) - \frac {1}{2} \, \log \left (-\frac {x^{2} + \sqrt {-x^{2} + 4} - 2}{x^{2}}\right ) \]
Verification of antiderivative is not currently implemented for this CAS.
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giac [A] time = 0.01, size = 14, normalized size = 0.88 \[ -\log \left (\sqrt {-x^{2} + 4} + 1\right ) \]
Verification of antiderivative is not currently implemented for this CAS.
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maple [B] time = 0.10, size = 266, normalized size = 16.62 \[ \frac {\arctanh \left (\frac {2-2 \sqrt {3}\, \left (x -\sqrt {3}\right )}{2 \sqrt {-\left (x -\sqrt {3}\right )^{2}-2 \sqrt {3}\, \left (x -\sqrt {3}\right )+1}}\right )}{2 \left (2+\sqrt {3}\right ) \left (-2+\sqrt {3}\right )}+\frac {\arctanh \left (\frac {2+2 \sqrt {3}\, \left (x +\sqrt {3}\right )}{2 \sqrt {-\left (x +\sqrt {3}\right )^{2}+2 \sqrt {3}\, \left (x +\sqrt {3}\right )+1}}\right )}{2 \left (2+\sqrt {3}\right ) \left (-2+\sqrt {3}\right )}-\frac {\ln \left (x^{2}-3\right )}{2}+\frac {\sqrt {-4 x -\left (x -2\right )^{2}+8}}{2 \left (2+\sqrt {3}\right ) \left (-2+\sqrt {3}\right )}-\frac {\sqrt {-\left (x +\sqrt {3}\right )^{2}+2 \sqrt {3}\, \left (x +\sqrt {3}\right )+1}}{2 \left (2+\sqrt {3}\right ) \left (-2+\sqrt {3}\right )}+\frac {\sqrt {4 x -\left (x +2\right )^{2}+8}}{2 \left (2+\sqrt {3}\right ) \left (-2+\sqrt {3}\right )}-\frac {\sqrt {-\left (x -\sqrt {3}\right )^{2}-2 \sqrt {3}\, \left (x -\sqrt {3}\right )+1}}{2 \left (2+\sqrt {3}\right ) \left (-2+\sqrt {3}\right )} \]
Verification of antiderivative is not currently implemented for this CAS.
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maxima [A] time = 0.62, size = 14, normalized size = 0.88 \[ -\log \left (\sqrt {-x^{2} + 4} + 1\right ) \]
Verification of antiderivative is not currently implemented for this CAS.
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mupad [B] time = 0.16, size = 87, normalized size = 5.44 \[ -\frac {\ln \left (x-\sqrt {3}\right )}{2}-\frac {\ln \left (\frac {\sqrt {3}\,x\,1{}\mathrm {i}+\sqrt {4-x^2}\,1{}\mathrm {i}+4{}\mathrm {i}}{x+\sqrt {3}}\right )}{2}-\frac {\ln \left (x+\sqrt {3}\right )}{2}-\frac {\ln \left (\frac {-\sqrt {3}\,x\,1{}\mathrm {i}+\sqrt {4-x^2}\,1{}\mathrm {i}+4{}\mathrm {i}}{x-\sqrt {3}}\right )}{2} \]
Verification of antiderivative is not currently implemented for this CAS.
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sympy [B] time = 5.40, size = 44, normalized size = 2.75 \[ \frac {\log {\left (2 \sqrt {4 - x^{2}} \right )}}{2} - \frac {\log {\left (2 \sqrt {4 - x^{2}} + 2 \right )}}{2} - \frac {\log {\left (x^{2} - \sqrt {4 - x^{2}} - 4 \right )}}{2} \]
Verification of antiderivative is not currently implemented for this CAS.
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