Integrand size = 17, antiderivative size = 48 \[ \int \frac {1}{\sqrt {1+x^2} \left (2+x^2\right )^2} \, dx=-\frac {x \sqrt {1+x^2}}{4 \left (2+x^2\right )}+\frac {3 \text {arctanh}\left (\frac {x}{\sqrt {2} \sqrt {1+x^2}}\right )}{4 \sqrt {2}} \]
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Time = 0.01 (sec) , antiderivative size = 48, normalized size of antiderivative = 1.00, number of steps used = 3, number of rules used = 3, \(\frac {\text {number of rules}}{\text {integrand size}}\) = 0.176, Rules used = {390, 385, 212} \[ \int \frac {1}{\sqrt {1+x^2} \left (2+x^2\right )^2} \, dx=\frac {3 \text {arctanh}\left (\frac {x}{\sqrt {2} \sqrt {x^2+1}}\right )}{4 \sqrt {2}}-\frac {x \sqrt {x^2+1}}{4 \left (x^2+2\right )} \]
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Rule 212
Rule 385
Rule 390
Rubi steps \begin{align*} \text {integral}& = -\frac {x \sqrt {1+x^2}}{4 \left (2+x^2\right )}+\frac {3}{4} \int \frac {1}{\sqrt {1+x^2} \left (2+x^2\right )} \, dx \\ & = -\frac {x \sqrt {1+x^2}}{4 \left (2+x^2\right )}+\frac {3}{4} \text {Subst}\left (\int \frac {1}{2-x^2} \, dx,x,\frac {x}{\sqrt {1+x^2}}\right ) \\ & = -\frac {x \sqrt {1+x^2}}{4 \left (2+x^2\right )}+\frac {3 \text {arctanh}\left (\frac {x}{\sqrt {2} \sqrt {1+x^2}}\right )}{4 \sqrt {2}} \\ \end{align*}
Time = 0.14 (sec) , antiderivative size = 55, normalized size of antiderivative = 1.15 \[ \int \frac {1}{\sqrt {1+x^2} \left (2+x^2\right )^2} \, dx=\frac {1}{8} \left (-\frac {2 x \sqrt {1+x^2}}{2+x^2}+3 \sqrt {2} \text {arctanh}\left (\frac {2+x^2-x \sqrt {1+x^2}}{\sqrt {2}}\right )\right ) \]
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Time = 0.30 (sec) , antiderivative size = 38, normalized size of antiderivative = 0.79
method | result | size |
risch | \(\frac {3 \,\operatorname {arctanh}\left (\frac {x \sqrt {2}}{2 \sqrt {x^{2}+1}}\right ) \sqrt {2}}{8}-\frac {x \sqrt {x^{2}+1}}{4 \left (x^{2}+2\right )}\) | \(38\) |
default | \(\frac {x}{4 \sqrt {x^{2}+1}\, \left (\frac {x^{2}}{x^{2}+1}-2\right )}+\frac {3 \,\operatorname {arctanh}\left (\frac {x \sqrt {2}}{2 \sqrt {x^{2}+1}}\right ) \sqrt {2}}{8}\) | \(46\) |
pseudoelliptic | \(\frac {\left (3 x^{2}+6\right ) \sqrt {2}\, \operatorname {arctanh}\left (\frac {\sqrt {2}\, \sqrt {x^{2}+1}}{x}\right )-2 x \sqrt {x^{2}+1}}{8 x^{2}+16}\) | \(48\) |
trager | \(-\frac {x \sqrt {x^{2}+1}}{4 \left (x^{2}+2\right )}+\frac {3 \operatorname {RootOf}\left (\textit {\_Z}^{2}-2\right ) \ln \left (\frac {3 \operatorname {RootOf}\left (\textit {\_Z}^{2}-2\right ) x^{2}+4 x \sqrt {x^{2}+1}+2 \operatorname {RootOf}\left (\textit {\_Z}^{2}-2\right )}{x^{2}+2}\right )}{16}\) | \(66\) |
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Leaf count of result is larger than twice the leaf count of optimal. 83 vs. \(2 (37) = 74\).
Time = 0.24 (sec) , antiderivative size = 83, normalized size of antiderivative = 1.73 \[ \int \frac {1}{\sqrt {1+x^2} \left (2+x^2\right )^2} \, dx=\frac {3 \, \sqrt {2} {\left (x^{2} + 2\right )} \log \left (\frac {9 \, x^{2} + 2 \, \sqrt {2} {\left (3 \, x^{2} + 2\right )} + 2 \, \sqrt {x^{2} + 1} {\left (3 \, \sqrt {2} x + 4 \, x\right )} + 6}{x^{2} + 2}\right ) - 4 \, x^{2} - 4 \, \sqrt {x^{2} + 1} x - 8}{16 \, {\left (x^{2} + 2\right )}} \]
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\[ \int \frac {1}{\sqrt {1+x^2} \left (2+x^2\right )^2} \, dx=\int \frac {1}{\sqrt {x^{2} + 1} \left (x^{2} + 2\right )^{2}}\, dx \]
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\[ \int \frac {1}{\sqrt {1+x^2} \left (2+x^2\right )^2} \, dx=\int { \frac {1}{{\left (x^{2} + 2\right )}^{2} \sqrt {x^{2} + 1}} \,d x } \]
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Leaf count of result is larger than twice the leaf count of optimal. 101 vs. \(2 (37) = 74\).
Time = 0.30 (sec) , antiderivative size = 101, normalized size of antiderivative = 2.10 \[ \int \frac {1}{\sqrt {1+x^2} \left (2+x^2\right )^2} \, dx=-\frac {3}{16} \, \sqrt {2} \log \left (\frac {{\left (x - \sqrt {x^{2} + 1}\right )}^{2} - 2 \, \sqrt {2} + 3}{{\left (x - \sqrt {x^{2} + 1}\right )}^{2} + 2 \, \sqrt {2} + 3}\right ) - \frac {3 \, {\left (x - \sqrt {x^{2} + 1}\right )}^{2} + 1}{2 \, {\left ({\left (x - \sqrt {x^{2} + 1}\right )}^{4} + 6 \, {\left (x - \sqrt {x^{2} + 1}\right )}^{2} + 1\right )}} \]
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Time = 0.10 (sec) , antiderivative size = 117, normalized size of antiderivative = 2.44 \[ \int \frac {1}{\sqrt {1+x^2} \left (2+x^2\right )^2} \, dx=-\frac {3\,\sqrt {2}\,\left (\ln \left (x-\sqrt {2}\,1{}\mathrm {i}\right )-\ln \left (1+\sqrt {2}\,x\,1{}\mathrm {i}+\sqrt {x^2+1}\,1{}\mathrm {i}\right )\right )}{16}+\frac {3\,\sqrt {2}\,\left (\ln \left (x+\sqrt {2}\,1{}\mathrm {i}\right )-\ln \left (1-\sqrt {2}\,x\,1{}\mathrm {i}+\sqrt {x^2+1}\,1{}\mathrm {i}\right )\right )}{16}-\frac {\sqrt {x^2+1}}{8\,\left (x-\sqrt {2}\,1{}\mathrm {i}\right )}-\frac {\sqrt {x^2+1}}{8\,\left (x+\sqrt {2}\,1{}\mathrm {i}\right )} \]
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