Optimal. Leaf size=16 \[ 2 \tanh ^{-1}\left (\frac {x}{\sqrt {4 x+x^2}}\right ) \]
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Rubi [A]
time = 0.00, antiderivative size = 16, normalized size of antiderivative = 1.00, number of steps
used = 2, number of rules used = 2, integrand size = 11, \(\frac {\text {number of rules}}{\text {integrand size}}\) = 0.182, Rules used = {634, 212}
\begin {gather*} 2 \tanh ^{-1}\left (\frac {x}{\sqrt {x^2+4 x}}\right ) \end {gather*}
Antiderivative was successfully verified.
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Rule 212
Rule 634
Rubi steps
\begin {align*} \int \frac {1}{\sqrt {4 x+x^2}} \, dx &=2 \text {Subst}\left (\int \frac {1}{1-x^2} \, dx,x,\frac {x}{\sqrt {4 x+x^2}}\right )\\ &=2 \tanh ^{-1}\left (\frac {x}{\sqrt {4 x+x^2}}\right )\\ \end {align*}
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Mathematica [B] Leaf count is larger than twice the leaf count of optimal. \(37\) vs. \(2(16)=32\).
time = 0.03, size = 37, normalized size = 2.31 \begin {gather*} \frac {2 \sqrt {x} \sqrt {4+x} \tanh ^{-1}\left (\frac {\sqrt {x}}{\sqrt {4+x}}\right )}{\sqrt {x (4+x)}} \end {gather*}
Antiderivative was successfully verified.
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Maple [A]
time = 0.37, size = 14, normalized size = 0.88
method | result | size |
meijerg | \(2 \arcsinh \left (\frac {\sqrt {x}}{2}\right )\) | \(9\) |
default | \(\ln \left (2+x +\sqrt {x^{2}+4 x}\right )\) | \(14\) |
trager | \(\ln \left (2+x +\sqrt {x^{2}+4 x}\right )\) | \(14\) |
Verification of antiderivative is not currently implemented for this CAS.
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Maxima [A]
time = 0.27, size = 17, normalized size = 1.06 \begin {gather*} \log \left (2 \, x + 2 \, \sqrt {x^{2} + 4 \, x} + 4\right ) \end {gather*}
Verification of antiderivative is not currently implemented for this CAS.
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Fricas [A]
time = 1.45, size = 17, normalized size = 1.06 \begin {gather*} -\log \left (-x + \sqrt {x^{2} + 4 \, x} - 2\right ) \end {gather*}
Verification of antiderivative is not currently implemented for this CAS.
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Sympy [F]
time = 0.00, size = 0, normalized size = 0.00 \begin {gather*} \int \frac {1}{\sqrt {x^{2} + 4 x}}\, dx \end {gather*}
Verification of antiderivative is not currently implemented for this CAS.
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Giac [B] Leaf count of result is larger than twice the leaf count of optimal. 33 vs.
\(2 (14) = 28\).
time = 1.97, size = 33, normalized size = 2.06 \begin {gather*} \frac {1}{2} \, \sqrt {x^{2} + 4 \, x} {\left (x + 2\right )} + 2 \, \log \left ({\left | -x + \sqrt {x^{2} + 4 \, x} - 2 \right |}\right ) \end {gather*}
Verification of antiderivative is not currently implemented for this CAS.
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Mupad [B]
time = 0.51, size = 11, normalized size = 0.69 \begin {gather*} \ln \left (x+\sqrt {x\,\left (x+4\right )}+2\right ) \end {gather*}
Verification of antiderivative is not currently implemented for this CAS.
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