Integrand size = 17, antiderivative size = 27 \[ \int \frac {\sqrt {1+x^2}}{2+x^2} \, dx=\text {arcsinh}(x)-\frac {\text {arctanh}\left (\frac {x}{\sqrt {2} \sqrt {1+x^2}}\right )}{\sqrt {2}} \]
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Time = 0.01 (sec) , antiderivative size = 27, normalized size of antiderivative = 1.00, number of steps used = 4, number of rules used = 4, \(\frac {\text {number of rules}}{\text {integrand size}}\) = 0.235, Rules used = {399, 221, 385, 212} \[ \int \frac {\sqrt {1+x^2}}{2+x^2} \, dx=\text {arcsinh}(x)-\frac {\text {arctanh}\left (\frac {x}{\sqrt {2} \sqrt {x^2+1}}\right )}{\sqrt {2}} \]
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Rule 212
Rule 221
Rule 385
Rule 399
Rubi steps \begin{align*} \text {integral}& = \int \frac {1}{\sqrt {1+x^2}} \, dx-\int \frac {1}{\sqrt {1+x^2} \left (2+x^2\right )} \, dx \\ & = \text {arcsinh}(x)-\text {Subst}\left (\int \frac {1}{2-x^2} \, dx,x,\frac {x}{\sqrt {1+x^2}}\right ) \\ & = \text {arcsinh}(x)-\frac {\text {arctanh}\left (\frac {x}{\sqrt {2} \sqrt {1+x^2}}\right )}{\sqrt {2}} \\ \end{align*}
Time = 0.13 (sec) , antiderivative size = 48, normalized size of antiderivative = 1.78 \[ \int \frac {\sqrt {1+x^2}}{2+x^2} \, dx=-\frac {\text {arctanh}\left (\frac {2+x^2-x \sqrt {1+x^2}}{\sqrt {2}}\right )}{\sqrt {2}}-\log \left (-x+\sqrt {1+x^2}\right ) \]
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Time = 0.27 (sec) , antiderivative size = 23, normalized size of antiderivative = 0.85
method | result | size |
default | \(\operatorname {arcsinh}\left (x \right )-\frac {\operatorname {arctanh}\left (\frac {x \sqrt {2}}{2 \sqrt {x^{2}+1}}\right ) \sqrt {2}}{2}\) | \(23\) |
pseudoelliptic | \(\frac {\ln \left (\frac {x +\sqrt {x^{2}+1}}{x}\right )}{2}-\frac {\sqrt {2}\, \operatorname {arctanh}\left (\frac {\sqrt {2}\, \sqrt {x^{2}+1}}{x}\right )}{2}-\frac {\ln \left (\frac {\sqrt {x^{2}+1}-x}{x}\right )}{2}\) | \(56\) |
trager | \(-\ln \left (-\sqrt {x^{2}+1}+x \right )-\frac {\operatorname {RootOf}\left (\textit {\_Z}^{2}-2\right ) \ln \left (\frac {3 \operatorname {RootOf}\left (\textit {\_Z}^{2}-2\right ) x^{2}+4 x \sqrt {x^{2}+1}+2 \operatorname {RootOf}\left (\textit {\_Z}^{2}-2\right )}{x^{2}+2}\right )}{4}\) | \(63\) |
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Leaf count of result is larger than twice the leaf count of optimal. 67 vs. \(2 (22) = 44\).
Time = 0.25 (sec) , antiderivative size = 67, normalized size of antiderivative = 2.48 \[ \int \frac {\sqrt {1+x^2}}{2+x^2} \, dx=\frac {1}{4} \, \sqrt {2} \log \left (\frac {9 \, x^{2} - 2 \, \sqrt {2} {\left (3 \, x^{2} + 2\right )} - 2 \, \sqrt {x^{2} + 1} {\left (3 \, \sqrt {2} x - 4 \, x\right )} + 6}{x^{2} + 2}\right ) - \log \left (-x + \sqrt {x^{2} + 1}\right ) \]
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\[ \int \frac {\sqrt {1+x^2}}{2+x^2} \, dx=\int \frac {\sqrt {x^{2} + 1}}{x^{2} + 2}\, dx \]
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\[ \int \frac {\sqrt {1+x^2}}{2+x^2} \, dx=\int { \frac {\sqrt {x^{2} + 1}}{x^{2} + 2} \,d x } \]
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Leaf count of result is larger than twice the leaf count of optimal. 64 vs. \(2 (22) = 44\).
Time = 0.30 (sec) , antiderivative size = 64, normalized size of antiderivative = 2.37 \[ \int \frac {\sqrt {1+x^2}}{2+x^2} \, dx=\frac {1}{4} \, \sqrt {2} \log \left (\frac {{\left (x - \sqrt {x^{2} + 1}\right )}^{2} - 2 \, \sqrt {2} + 3}{{\left (x - \sqrt {x^{2} + 1}\right )}^{2} + 2 \, \sqrt {2} + 3}\right ) - \log \left (-x + \sqrt {x^{2} + 1}\right ) \]
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Time = 0.18 (sec) , antiderivative size = 77, normalized size of antiderivative = 2.85 \[ \int \frac {\sqrt {1+x^2}}{2+x^2} \, dx=\mathrm {asinh}\left (x\right )+\frac {\sqrt {2}\,\left (\ln \left (x-\sqrt {2}\,1{}\mathrm {i}\right )-\ln \left (1+\sqrt {2}\,x\,1{}\mathrm {i}+\sqrt {x^2+1}\,1{}\mathrm {i}\right )\right )}{4}-\frac {\sqrt {2}\,\left (\ln \left (x+\sqrt {2}\,1{}\mathrm {i}\right )-\ln \left (1-\sqrt {2}\,x\,1{}\mathrm {i}+\sqrt {x^2+1}\,1{}\mathrm {i}\right )\right )}{4} \]
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