Optimal. Leaf size=61 \[ \sqrt{x^2-x-1}+\frac{3}{2} \tanh ^{-1}\left (\frac{1-2 x}{2 \sqrt{x^2-x-1}}\right )+\tanh ^{-1}\left (\frac{3 x+1}{2 \sqrt{x^2-x-1}}\right ) \]
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Rubi [A] time = 0.0425961, antiderivative size = 61, normalized size of antiderivative = 1., number of steps used = 6, number of rules used = 5, integrand size = 18, \(\frac{\text{number of rules}}{\text{integrand size}}\) = 0.278, Rules used = {734, 843, 621, 206, 724} \[ \sqrt{x^2-x-1}+\frac{3}{2} \tanh ^{-1}\left (\frac{1-2 x}{2 \sqrt{x^2-x-1}}\right )+\tanh ^{-1}\left (\frac{3 x+1}{2 \sqrt{x^2-x-1}}\right ) \]
Antiderivative was successfully verified.
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Rule 734
Rule 843
Rule 621
Rule 206
Rule 724
Rubi steps
\begin{align*} \int \frac{\sqrt{-1-x+x^2}}{1+x} \, dx &=\sqrt{-1-x+x^2}-\frac{1}{2} \int \frac{1+3 x}{(1+x) \sqrt{-1-x+x^2}} \, dx\\ &=\sqrt{-1-x+x^2}-\frac{3}{2} \int \frac{1}{\sqrt{-1-x+x^2}} \, dx+\int \frac{1}{(1+x) \sqrt{-1-x+x^2}} \, dx\\ &=\sqrt{-1-x+x^2}-2 \operatorname{Subst}\left (\int \frac{1}{4-x^2} \, dx,x,\frac{-1-3 x}{\sqrt{-1-x+x^2}}\right )-3 \operatorname{Subst}\left (\int \frac{1}{4-x^2} \, dx,x,\frac{-1+2 x}{\sqrt{-1-x+x^2}}\right )\\ &=\sqrt{-1-x+x^2}+\frac{3}{2} \tanh ^{-1}\left (\frac{1-2 x}{2 \sqrt{-1-x+x^2}}\right )+\tanh ^{-1}\left (\frac{1+3 x}{2 \sqrt{-1-x+x^2}}\right )\\ \end{align*}
Mathematica [A] time = 0.0165095, size = 63, normalized size = 1.03 \[ \sqrt{x^2-x-1}-\tanh ^{-1}\left (\frac{-3 x-1}{2 \sqrt{x^2-x-1}}\right )-\frac{3}{2} \tanh ^{-1}\left (\frac{2 x-1}{2 \sqrt{x^2-x-1}}\right ) \]
Antiderivative was successfully verified.
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Maple [A] time = 0.042, size = 54, normalized size = 0.9 \begin{align*} \sqrt{ \left ( 1+x \right ) ^{2}-2-3\,x}-{\frac{3}{2}\ln \left ( -{\frac{1}{2}}+x+\sqrt{ \left ( 1+x \right ) ^{2}-2-3\,x} \right ) }-{\it Artanh} \left ({\frac{-1-3\,x}{2}{\frac{1}{\sqrt{ \left ( 1+x \right ) ^{2}-2-3\,x}}}} \right ) \end{align*}
Verification of antiderivative is not currently implemented for this CAS.
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Maxima [A] time = 0.993341, size = 84, normalized size = 1.38 \begin{align*} \sqrt{x^{2} - x - 1} - \frac{3}{2} \, \log \left (2 \, x + 2 \, \sqrt{x^{2} - x - 1} - 1\right ) - \log \left (\frac{2 \, \sqrt{x^{2} - x - 1}}{{\left | x + 1 \right |}} + \frac{2}{{\left | x + 1 \right |}} - 3\right ) \end{align*}
Verification of antiderivative is not currently implemented for this CAS.
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Fricas [A] time = 2.37564, size = 169, normalized size = 2.77 \begin{align*} \sqrt{x^{2} - x - 1} - \log \left (-x + \sqrt{x^{2} - x - 1}\right ) + \log \left (-x + \sqrt{x^{2} - x - 1} - 2\right ) + \frac{3}{2} \, \log \left (-2 \, x + 2 \, \sqrt{x^{2} - x - 1} + 1\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 \frac{\sqrt{x^{2} - x - 1}}{x + 1}\, dx \end{align*}
Verification of antiderivative is not currently implemented for this CAS.
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Giac [A] time = 1.08727, size = 90, normalized size = 1.48 \begin{align*} \sqrt{x^{2} - x - 1} - \log \left ({\left | -x + \sqrt{x^{2} - x - 1} \right |}\right ) + \log \left ({\left | -x + \sqrt{x^{2} - x - 1} - 2 \right |}\right ) + \frac{3}{2} \, \log \left ({\left | -2 \, x + 2 \, \sqrt{x^{2} - x - 1} + 1 \right |}\right ) \end{align*}
Verification of antiderivative is not currently implemented for this CAS.
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