Integrand size = 30, antiderivative size = 242 \[ \int \frac {-1+x^2}{\left (1+x^2\right ) \sqrt {x^2+\sqrt {1+x^4}}} \, dx=\frac {x}{2 \sqrt {x^2+\sqrt {1+x^4}}}+2 \sqrt {2} \arctan \left (\frac {\sqrt {2} x \sqrt {x^2+\sqrt {1+x^4}}}{1+x^2+\sqrt {1+x^4}}\right )-2 \sqrt {1+\sqrt {2}} \arctan \left (\frac {\sqrt {2 \left (1+\sqrt {2}\right )} x \sqrt {x^2+\sqrt {1+x^4}}}{1+x^2+\sqrt {1+x^4}}\right )+\frac {\text {arctanh}\left (\frac {\sqrt {2} x \sqrt {x^2+\sqrt {1+x^4}}}{1+x^2+\sqrt {1+x^4}}\right )}{\sqrt {2}}-2 \sqrt {-1+\sqrt {2}} \text {arctanh}\left (\frac {\sqrt {2 \left (-1+\sqrt {2}\right )} x \sqrt {x^2+\sqrt {1+x^4}}}{1+x^2+\sqrt {1+x^4}}\right ) \]
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\[ \int \frac {-1+x^2}{\left (1+x^2\right ) \sqrt {x^2+\sqrt {1+x^4}}} \, dx=\int \frac {-1+x^2}{\left (1+x^2\right ) \sqrt {x^2+\sqrt {1+x^4}}} \, dx \]
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Rubi steps \begin{align*} \text {integral}& = \int \left (\frac {1}{\sqrt {x^2+\sqrt {1+x^4}}}-\frac {2}{\left (1+x^2\right ) \sqrt {x^2+\sqrt {1+x^4}}}\right ) \, dx \\ & = -\left (2 \int \frac {1}{\left (1+x^2\right ) \sqrt {x^2+\sqrt {1+x^4}}} \, dx\right )+\int \frac {1}{\sqrt {x^2+\sqrt {1+x^4}}} \, dx \\ & = -\left (2 \int \left (\frac {i}{2 (i-x) \sqrt {x^2+\sqrt {1+x^4}}}+\frac {i}{2 (i+x) \sqrt {x^2+\sqrt {1+x^4}}}\right ) \, dx\right )+\int \frac {1}{\sqrt {x^2+\sqrt {1+x^4}}} \, dx \\ & = -\left (i \int \frac {1}{(i-x) \sqrt {x^2+\sqrt {1+x^4}}} \, dx\right )-i \int \frac {1}{(i+x) \sqrt {x^2+\sqrt {1+x^4}}} \, dx+\int \frac {1}{\sqrt {x^2+\sqrt {1+x^4}}} \, dx \\ \end{align*}
Time = 0.83 (sec) , antiderivative size = 242, normalized size of antiderivative = 1.00 \[ \int \frac {-1+x^2}{\left (1+x^2\right ) \sqrt {x^2+\sqrt {1+x^4}}} \, dx=\frac {x}{2 \sqrt {x^2+\sqrt {1+x^4}}}+2 \sqrt {2} \arctan \left (\frac {-1+x^2+\sqrt {1+x^4}}{\sqrt {2} x \sqrt {x^2+\sqrt {1+x^4}}}\right )-2 \sqrt {1+\sqrt {2}} \arctan \left (\frac {\sqrt {\frac {1}{2}+\frac {1}{\sqrt {2}}} \left (-1+x^2+\sqrt {1+x^4}\right )}{x \sqrt {x^2+\sqrt {1+x^4}}}\right )+\frac {\text {arctanh}\left (\frac {-1+x^2+\sqrt {1+x^4}}{\sqrt {2} x \sqrt {x^2+\sqrt {1+x^4}}}\right )}{\sqrt {2}}-2 \sqrt {-1+\sqrt {2}} \text {arctanh}\left (\frac {-1+x^2+\sqrt {1+x^4}}{\sqrt {2 \left (1+\sqrt {2}\right )} x \sqrt {x^2+\sqrt {1+x^4}}}\right ) \]
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\[\int \frac {x^{2}-1}{\left (x^{2}+1\right ) \sqrt {x^{2}+\sqrt {x^{4}+1}}}d x\]
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Leaf count of result is larger than twice the leaf count of optimal. 574 vs. \(2 (189) = 378\).
Time = 2.76 (sec) , antiderivative size = 574, normalized size of antiderivative = 2.37 \[ \int \frac {-1+x^2}{\left (1+x^2\right ) \sqrt {x^2+\sqrt {1+x^4}}} \, dx=-\frac {1}{2} \, {\left (x^{3} - \sqrt {x^{4} + 1} x\right )} \sqrt {x^{2} + \sqrt {x^{4} + 1}} - \sqrt {2} \arctan \left (-\frac {{\left (\sqrt {2} x^{2} - \sqrt {2} \sqrt {x^{4} + 1}\right )} \sqrt {x^{2} + \sqrt {x^{4} + 1}}}{2 \, x}\right ) + \frac {1}{8} \, \sqrt {2} \log \left (4 \, x^{4} + 4 \, \sqrt {x^{4} + 1} x^{2} + 2 \, {\left (\sqrt {2} x^{3} + \sqrt {2} \sqrt {x^{4} + 1} x\right )} \sqrt {x^{2} + \sqrt {x^{4} + 1}} + 1\right ) + \frac {1}{4} \, \sqrt {-4 \, \sqrt {2} - 4} \log \left (-\frac {2 \, \sqrt {2} x^{2} - 4 \, x^{2} + \sqrt {x^{2} + \sqrt {x^{4} + 1}} {\left (\sqrt {x^{4} + 1} {\left (\sqrt {2} x - x\right )} \sqrt {-4 \, \sqrt {2} - 4} + {\left (x^{3} - \sqrt {2} {\left (x^{3} + 2 \, x\right )} + 3 \, x\right )} \sqrt {-4 \, \sqrt {2} - 4}\right )} + 2 \, \sqrt {x^{4} + 1} {\left (\sqrt {2} - 1\right )}}{x^{2} + 1}\right ) - \frac {1}{4} \, \sqrt {-4 \, \sqrt {2} - 4} \log \left (-\frac {2 \, \sqrt {2} x^{2} - 4 \, x^{2} - \sqrt {x^{2} + \sqrt {x^{4} + 1}} {\left (\sqrt {x^{4} + 1} {\left (\sqrt {2} x - x\right )} \sqrt {-4 \, \sqrt {2} - 4} + {\left (x^{3} - \sqrt {2} {\left (x^{3} + 2 \, x\right )} + 3 \, x\right )} \sqrt {-4 \, \sqrt {2} - 4}\right )} + 2 \, \sqrt {x^{4} + 1} {\left (\sqrt {2} - 1\right )}}{x^{2} + 1}\right ) - \frac {1}{2} \, \sqrt {\sqrt {2} - 1} \log \left (\frac {2 \, {\left (\sqrt {2} x^{2} + 2 \, x^{2} + {\left (x^{3} + \sqrt {2} {\left (x^{3} + 2 \, x\right )} - \sqrt {x^{4} + 1} {\left (\sqrt {2} x + x\right )} + 3 \, x\right )} \sqrt {x^{2} + \sqrt {x^{4} + 1}} \sqrt {\sqrt {2} - 1} + \sqrt {x^{4} + 1} {\left (\sqrt {2} + 1\right )}\right )}}{x^{2} + 1}\right ) + \frac {1}{2} \, \sqrt {\sqrt {2} - 1} \log \left (\frac {2 \, {\left (\sqrt {2} x^{2} + 2 \, x^{2} - {\left (x^{3} + \sqrt {2} {\left (x^{3} + 2 \, x\right )} - \sqrt {x^{4} + 1} {\left (\sqrt {2} x + x\right )} + 3 \, x\right )} \sqrt {x^{2} + \sqrt {x^{4} + 1}} \sqrt {\sqrt {2} - 1} + \sqrt {x^{4} + 1} {\left (\sqrt {2} + 1\right )}\right )}}{x^{2} + 1}\right ) \]
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\[ \int \frac {-1+x^2}{\left (1+x^2\right ) \sqrt {x^2+\sqrt {1+x^4}}} \, dx=\int \frac {\left (x - 1\right ) \left (x + 1\right )}{\left (x^{2} + 1\right ) \sqrt {x^{2} + \sqrt {x^{4} + 1}}}\, dx \]
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\[ \int \frac {-1+x^2}{\left (1+x^2\right ) \sqrt {x^2+\sqrt {1+x^4}}} \, dx=\int { \frac {x^{2} - 1}{\sqrt {x^{2} + \sqrt {x^{4} + 1}} {\left (x^{2} + 1\right )}} \,d x } \]
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\[ \int \frac {-1+x^2}{\left (1+x^2\right ) \sqrt {x^2+\sqrt {1+x^4}}} \, dx=\int { \frac {x^{2} - 1}{\sqrt {x^{2} + \sqrt {x^{4} + 1}} {\left (x^{2} + 1\right )}} \,d x } \]
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Timed out. \[ \int \frac {-1+x^2}{\left (1+x^2\right ) \sqrt {x^2+\sqrt {1+x^4}}} \, dx=\int \frac {x^2-1}{\left (x^2+1\right )\,\sqrt {\sqrt {x^4+1}+x^2}} \,d x \]
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