Optimal. Leaf size=14 \[ -2 \log \left (\sqrt {4-x}+1\right ) \]
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Rubi [A] time = 0.02, antiderivative size = 14, normalized size of antiderivative = 1.00, number of steps used = 2, number of rules used = 1, integrand size = 16, \(\frac {\text {number of rules}}{\text {integrand size}}\) = 0.062, Rules used = {31} \[ -2 \log \left (\sqrt {4-x}+1\right ) \]
Antiderivative was successfully verified.
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Rule 31
Rubi steps
\begin {align*} \int \frac {1}{4+\sqrt {4-x}-x} \, dx &=-\left (2 \operatorname {Subst}\left (\int \frac {1}{1+x} \, dx,x,\sqrt {4-x}\right )\right )\\ &=-2 \log \left (1+\sqrt {4-x}\right )\\ \end {align*}
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Mathematica [A] time = 0.01, size = 14, normalized size = 1.00 \[ -2 \log \left (\sqrt {4-x}+1\right ) \]
Antiderivative was successfully verified.
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fricas [A] time = 0.44, size = 12, normalized size = 0.86 \[ -2 \, \log \left (\sqrt {-x + 4} + 1\right ) \]
Verification of antiderivative is not currently implemented for this CAS.
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giac [A] time = 0.31, size = 12, normalized size = 0.86 \[ -2 \, \log \left (\sqrt {-x + 4} + 1\right ) \]
Verification of antiderivative is not currently implemented for this CAS.
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maple [A] time = 0.01, size = 18, normalized size = 1.29 \[ -2 \arctanh \left (\sqrt {-x +4}\right )-\ln \left (x -3\right ) \]
Verification of antiderivative is not currently implemented for this CAS.
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maxima [A] time = 0.66, size = 12, normalized size = 0.86 \[ -2 \, \log \left (\sqrt {-x + 4} + 1\right ) \]
Verification of antiderivative is not currently implemented for this CAS.
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mupad [B] time = 0.19, size = 12, normalized size = 0.86 \[ -2\,\ln \left (\sqrt {4-x}+1\right ) \]
Verification of antiderivative is not currently implemented for this CAS.
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sympy [B] time = 4.23, size = 32, normalized size = 2.29 \[ \log {\left (2 \sqrt {4 - x} \right )} - \log {\left (2 \sqrt {4 - x} + 2 \right )} - \log {\left (x - \sqrt {4 - x} - 4 \right )} \]
Verification of antiderivative is not currently implemented for this CAS.
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