Optimal. Leaf size=106 \[ -\sqrt {\frac {1}{2} \left (1+\sqrt {5}\right )} \tan ^{-1}\left (\sqrt {\frac {1}{2} \left (1+\sqrt {5}\right )} \sqrt {1-x^2}\right )+x \tan ^{-1}\left (x \sqrt {1-x^2}\right )+\sqrt {\frac {1}{2} \left (-1+\sqrt {5}\right )} \tanh ^{-1}\left (\sqrt {\frac {1}{2} \left (-1+\sqrt {5}\right )} \sqrt {1-x^2}\right ) \]
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Rubi [A]
time = 0.08, antiderivative size = 106, normalized size of antiderivative = 1.00, number of steps
used = 6, number of rules used = 6, integrand size = 14, \(\frac {\text {number of rules}}{\text {integrand size}}\) = 0.429, Rules used = {5311, 1699,
840, 1180, 210, 212} \begin {gather*} -\sqrt {\frac {2}{\sqrt {5}-1}} \text {ArcTan}\left (\sqrt {\frac {2}{\sqrt {5}-1}} \sqrt {1-x^2}\right )+x \text {ArcTan}\left (x \sqrt {1-x^2}\right )+\sqrt {\frac {2}{1+\sqrt {5}}} \tanh ^{-1}\left (\sqrt {\frac {2}{1+\sqrt {5}}} \sqrt {1-x^2}\right ) \end {gather*}
Antiderivative was successfully verified.
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Rule 210
Rule 212
Rule 840
Rule 1180
Rule 1699
Rule 5311
Rubi steps
\begin {align*} \int \tan ^{-1}\left (x \sqrt {1-x^2}\right ) \, dx &=x \tan ^{-1}\left (x \sqrt {1-x^2}\right )-\int \frac {x \left (1-2 x^2\right )}{\sqrt {1-x^2} \left (1+x^2-x^4\right )} \, dx\\ &=x \tan ^{-1}\left (x \sqrt {1-x^2}\right )-\frac {1}{2} \text {Subst}\left (\int \frac {1-2 x}{\sqrt {1-x} \left (1+x-x^2\right )} \, dx,x,x^2\right )\\ &=x \tan ^{-1}\left (x \sqrt {1-x^2}\right )-\text {Subst}\left (\int \frac {1-2 x^2}{1+x^2-x^4} \, dx,x,\sqrt {1-x^2}\right )\\ &=x \tan ^{-1}\left (x \sqrt {1-x^2}\right )+\text {Subst}\left (\int \frac {1}{\frac {1}{2}-\frac {\sqrt {5}}{2}-x^2} \, dx,x,\sqrt {1-x^2}\right )+\text {Subst}\left (\int \frac {1}{\frac {1}{2}+\frac {\sqrt {5}}{2}-x^2} \, dx,x,\sqrt {1-x^2}\right )\\ &=-\sqrt {\frac {2}{-1+\sqrt {5}}} \tan ^{-1}\left (\sqrt {\frac {2}{-1+\sqrt {5}}} \sqrt {1-x^2}\right )+x \tan ^{-1}\left (x \sqrt {1-x^2}\right )+\sqrt {\frac {2}{1+\sqrt {5}}} \tanh ^{-1}\left (\sqrt {\frac {2}{1+\sqrt {5}}} \sqrt {1-x^2}\right )\\ \end {align*}
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Mathematica [A]
time = 0.20, size = 106, normalized size = 1.00 \begin {gather*} x \tan ^{-1}\left (x \sqrt {1-x^2}\right )-\frac {\sqrt {1+\sqrt {5}} \tan ^{-1}\left (\sqrt {\frac {1}{2} \left (1+\sqrt {5}\right )} \sqrt {1-x^2}\right )-\sqrt {-1+\sqrt {5}} \tanh ^{-1}\left (\sqrt {\frac {1}{2} \left (-1+\sqrt {5}\right )} \sqrt {1-x^2}\right )}{\sqrt {2}} \end {gather*}
Antiderivative was successfully verified.
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Maple [B] Leaf count of result is larger than twice the leaf count of optimal. \(209\) vs.
\(2(79)=158\).
time = 0.05, size = 210, normalized size = 1.98
method | result | size |
default | \(x \arctan \left (x \sqrt {-x^{2}+1}\right )+\frac {\sqrt {5}\, \arctanh \left (\frac {\frac {2 \left (\sqrt {-x^{2}+1}-1\right )^{2}}{x^{2}}+4+2 \sqrt {5}}{4 \sqrt {2+\sqrt {5}}}\right )}{5 \sqrt {2+\sqrt {5}}}+\frac {\sqrt {5}\, \arctan \left (\frac {\frac {2 \left (\sqrt {-x^{2}+1}-1\right )^{2}}{x^{2}}-2 \sqrt {5}+4}{4 \sqrt {-2+\sqrt {5}}}\right )}{5 \sqrt {-2+\sqrt {5}}}+\frac {\left (\frac {1}{2}+\frac {3 \sqrt {5}}{10}\right ) \arctanh \left (\frac {\frac {2 \left (\sqrt {-x^{2}+1}-1\right )^{2}}{x^{2}}+4+2 \sqrt {5}}{4 \sqrt {2+\sqrt {5}}}\right )}{\sqrt {2+\sqrt {5}}}+\frac {\left (-\frac {1}{2}+\frac {3 \sqrt {5}}{10}\right ) \arctan \left (\frac {\frac {2 \left (\sqrt {-x^{2}+1}-1\right )^{2}}{x^{2}}-2 \sqrt {5}+4}{4 \sqrt {-2+\sqrt {5}}}\right )}{\sqrt {-2+\sqrt {5}}}\) | \(210\) |
Verification of antiderivative is not currently implemented for this CAS.
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Maxima [F]
time = 0.00, size = 0, normalized size = 0.00 \begin {gather*} \text {Failed to integrate} \end {gather*}
Verification of antiderivative is not currently implemented for this CAS.
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Fricas [B] Leaf count of result is larger than twice the leaf count of optimal. 164 vs.
\(2 (79) = 158\).
time = 0.79, size = 164, normalized size = 1.55 \begin {gather*} x \arctan \left (\sqrt {-x^{2} + 1} x\right ) + \sqrt {2} \sqrt {\sqrt {5} + 1} \arctan \left (-\frac {1}{2} \, \sqrt {2} \sqrt {-x^{2} + 1} \sqrt {\sqrt {5} + 1} + \frac {1}{8} \, \sqrt {2} \sqrt {-16 \, x^{2} + 8 \, \sqrt {5} + 8} \sqrt {\sqrt {5} + 1}\right ) + \frac {1}{4} \, \sqrt {2} \sqrt {\sqrt {5} - 1} \log \left ({\left (\sqrt {5} \sqrt {2} + \sqrt {2}\right )} \sqrt {\sqrt {5} - 1} + 4 \, \sqrt {-x^{2} + 1}\right ) - \frac {1}{4} \, \sqrt {2} \sqrt {\sqrt {5} - 1} \log \left (-{\left (\sqrt {5} \sqrt {2} + \sqrt {2}\right )} \sqrt {\sqrt {5} - 1} + 4 \, \sqrt {-x^{2} + 1}\right ) \end {gather*}
Verification of antiderivative is not currently implemented for this CAS.
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Sympy [F(-1)] Timed out
time = 0.00, size = 0, normalized size = 0.00 \begin {gather*} \text {Timed out} \end {gather*}
Verification of antiderivative is not currently implemented for this CAS.
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Giac [A]
time = 0.62, size = 111, normalized size = 1.05 \begin {gather*} x \arctan \left (\sqrt {-x^{2} + 1} x\right ) - \frac {1}{2} \, \sqrt {2 \, \sqrt {5} + 2} \arctan \left (\frac {\sqrt {-x^{2} + 1}}{\sqrt {\frac {1}{2} \, \sqrt {5} - \frac {1}{2}}}\right ) + \frac {1}{4} \, \sqrt {2 \, \sqrt {5} - 2} \log \left (\sqrt {-x^{2} + 1} + \sqrt {\frac {1}{2} \, \sqrt {5} + \frac {1}{2}}\right ) - \frac {1}{4} \, \sqrt {2 \, \sqrt {5} - 2} \log \left ({\left | \sqrt {-x^{2} + 1} - \sqrt {\frac {1}{2} \, \sqrt {5} + \frac {1}{2}} \right |}\right ) \end {gather*}
Verification of antiderivative is not currently implemented for this CAS.
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Mupad [B]
time = 1.16, size = 455, normalized size = 4.29 \begin {gather*} x\,\mathrm {atan}\left (x\,\sqrt {1-x^2}\right )+\frac {\ln \left (\frac {\frac {\left (x\,\sqrt {\frac {\sqrt {5}}{2}+\frac {1}{2}}-1\right )\,1{}\mathrm {i}}{\sqrt {\frac {1}{2}-\frac {\sqrt {5}}{2}}}-\sqrt {1-x^2}\,1{}\mathrm {i}}{x-\sqrt {\frac {\sqrt {5}}{2}+\frac {1}{2}}}\right )\,\left (\sqrt {\frac {\sqrt {5}}{2}+\frac {1}{2}}-2\,{\left (\frac {\sqrt {5}}{2}+\frac {1}{2}\right )}^{3/2}\right )}{\left (2\,\sqrt {\frac {\sqrt {5}}{2}+\frac {1}{2}}-4\,{\left (\frac {\sqrt {5}}{2}+\frac {1}{2}\right )}^{3/2}\right )\,\sqrt {\frac {1}{2}-\frac {\sqrt {5}}{2}}}+\frac {\ln \left (\frac {\frac {\left (x\,\sqrt {\frac {1}{2}-\frac {\sqrt {5}}{2}}-1\right )\,1{}\mathrm {i}}{\sqrt {\frac {\sqrt {5}}{2}+\frac {1}{2}}}-\sqrt {1-x^2}\,1{}\mathrm {i}}{x-\sqrt {\frac {1}{2}-\frac {\sqrt {5}}{2}}}\right )\,\left (\sqrt {\frac {1}{2}-\frac {\sqrt {5}}{2}}-2\,{\left (\frac {1}{2}-\frac {\sqrt {5}}{2}\right )}^{3/2}\right )}{\left (2\,\sqrt {\frac {1}{2}-\frac {\sqrt {5}}{2}}-4\,{\left (\frac {1}{2}-\frac {\sqrt {5}}{2}\right )}^{3/2}\right )\,\sqrt {\frac {\sqrt {5}}{2}+\frac {1}{2}}}+\frac {\ln \left (\frac {\frac {\left (x\,\sqrt {\frac {\sqrt {5}}{2}+\frac {1}{2}}+1\right )\,1{}\mathrm {i}}{\sqrt {\frac {1}{2}-\frac {\sqrt {5}}{2}}}+\sqrt {1-x^2}\,1{}\mathrm {i}}{x+\sqrt {\frac {\sqrt {5}}{2}+\frac {1}{2}}}\right )\,\left (\sqrt {\frac {\sqrt {5}}{2}+\frac {1}{2}}-2\,{\left (\frac {\sqrt {5}}{2}+\frac {1}{2}\right )}^{3/2}\right )}{\left (2\,\sqrt {\frac {\sqrt {5}}{2}+\frac {1}{2}}-4\,{\left (\frac {\sqrt {5}}{2}+\frac {1}{2}\right )}^{3/2}\right )\,\sqrt {\frac {1}{2}-\frac {\sqrt {5}}{2}}}+\frac {\ln \left (\frac {\frac {\left (x\,\sqrt {\frac {1}{2}-\frac {\sqrt {5}}{2}}+1\right )\,1{}\mathrm {i}}{\sqrt {\frac {\sqrt {5}}{2}+\frac {1}{2}}}+\sqrt {1-x^2}\,1{}\mathrm {i}}{x+\sqrt {\frac {1}{2}-\frac {\sqrt {5}}{2}}}\right )\,\left (\sqrt {\frac {1}{2}-\frac {\sqrt {5}}{2}}-2\,{\left (\frac {1}{2}-\frac {\sqrt {5}}{2}\right )}^{3/2}\right )}{\left (2\,\sqrt {\frac {1}{2}-\frac {\sqrt {5}}{2}}-4\,{\left (\frac {1}{2}-\frac {\sqrt {5}}{2}\right )}^{3/2}\right )\,\sqrt {\frac {\sqrt {5}}{2}+\frac {1}{2}}} \end {gather*}
Verification of antiderivative is not currently implemented for this CAS.
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