Integrand size = 19, antiderivative size = 30 \[ \int \frac {\sqrt {1-x^2}}{1+x^2} \, dx=-\arcsin (x)+\sqrt {2} \arctan \left (\frac {\sqrt {2} x}{\sqrt {1-x^2}}\right ) \]
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Time = 0.01 (sec) , antiderivative size = 30, normalized size of antiderivative = 1.00, number of steps used = 4, number of rules used = 4, \(\frac {\text {number of rules}}{\text {integrand size}}\) = 0.211, Rules used = {399, 222, 385, 209} \[ \int \frac {\sqrt {1-x^2}}{1+x^2} \, dx=\sqrt {2} \arctan \left (\frac {\sqrt {2} x}{\sqrt {1-x^2}}\right )-\arcsin (x) \]
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Rule 209
Rule 222
Rule 385
Rule 399
Rubi steps \begin{align*} \text {integral}& = 2 \int \frac {1}{\sqrt {1-x^2} \left (1+x^2\right )} \, dx-\int \frac {1}{\sqrt {1-x^2}} \, dx \\ & = -\sin ^{-1}(x)+2 \text {Subst}\left (\int \frac {1}{1+2 x^2} \, dx,x,\frac {x}{\sqrt {1-x^2}}\right ) \\ & = -\sin ^{-1}(x)+\sqrt {2} \tan ^{-1}\left (\frac {\sqrt {2} x}{\sqrt {1-x^2}}\right ) \\ \end{align*}
Time = 0.08 (sec) , antiderivative size = 46, normalized size of antiderivative = 1.53 \[ \int \frac {\sqrt {1-x^2}}{1+x^2} \, dx=\sqrt {2} \arctan \left (\frac {\sqrt {2} x}{\sqrt {1-x^2}}\right )+2 \arctan \left (\frac {\sqrt {1-x^2}}{1+x}\right ) \]
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Time = 2.62 (sec) , antiderivative size = 33, normalized size of antiderivative = 1.10
method | result | size |
default | \(-\arcsin \left (x \right )-\sqrt {2}\, \arctan \left (\frac {\sqrt {2}\, \sqrt {-x^{2}+1}\, x}{x^{2}-1}\right )\) | \(33\) |
pseudoelliptic | \(\arctan \left (\frac {\sqrt {-x^{2}+1}}{x}\right )-\sqrt {2}\, \arctan \left (\frac {\sqrt {2}\, \sqrt {-x^{2}+1}}{2 x}\right )\) | \(39\) |
trager | \(\operatorname {RootOf}\left (\textit {\_Z}^{2}+1\right ) \ln \left (-\operatorname {RootOf}\left (\textit {\_Z}^{2}+1\right ) \sqrt {-x^{2}+1}+x \right )-\frac {\operatorname {RootOf}\left (\textit {\_Z}^{2}+2\right ) \ln \left (\frac {3 \operatorname {RootOf}\left (\textit {\_Z}^{2}+2\right ) x^{2}+4 x \sqrt {-x^{2}+1}-\operatorname {RootOf}\left (\textit {\_Z}^{2}+2\right )}{x^{2}+1}\right )}{2}\) | \(78\) |
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none
Time = 0.25 (sec) , antiderivative size = 42, normalized size of antiderivative = 1.40 \[ \int \frac {\sqrt {1-x^2}}{1+x^2} \, dx=-\sqrt {2} \arctan \left (\frac {\sqrt {2} \sqrt {-x^{2} + 1}}{2 \, x}\right ) + 2 \, \arctan \left (\frac {\sqrt {-x^{2} + 1} - 1}{x}\right ) \]
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\[ \int \frac {\sqrt {1-x^2}}{1+x^2} \, dx=\int \frac {\sqrt {- \left (x - 1\right ) \left (x + 1\right )}}{x^{2} + 1}\, dx \]
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\[ \int \frac {\sqrt {1-x^2}}{1+x^2} \, dx=\int { \frac {\sqrt {-x^{2} + 1}}{x^{2} + 1} \,d x } \]
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Leaf count of result is larger than twice the leaf count of optimal. 95 vs. \(2 (24) = 48\).
Time = 0.28 (sec) , antiderivative size = 95, normalized size of antiderivative = 3.17 \[ \int \frac {\sqrt {1-x^2}}{1+x^2} \, dx=-\frac {1}{2} \, \pi \mathrm {sgn}\left (x\right ) + \frac {1}{2} \, \sqrt {2} {\left (\pi \mathrm {sgn}\left (x\right ) + 2 \, \arctan \left (-\frac {\sqrt {2} x {\left (\frac {{\left (\sqrt {-x^{2} + 1} - 1\right )}^{2}}{x^{2}} - 1\right )}}{4 \, {\left (\sqrt {-x^{2} + 1} - 1\right )}}\right )\right )} - \arctan \left (-\frac {x {\left (\frac {{\left (\sqrt {-x^{2} + 1} - 1\right )}^{2}}{x^{2}} - 1\right )}}{2 \, {\left (\sqrt {-x^{2} + 1} - 1\right )}}\right ) \]
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Time = 0.41 (sec) , antiderivative size = 83, normalized size of antiderivative = 2.77 \[ \int \frac {\sqrt {1-x^2}}{1+x^2} \, dx=-\mathrm {asin}\left (x\right )+\frac {\sqrt {2}\,\ln \left (\frac {\frac {\sqrt {2}\,\left (-1+x\,1{}\mathrm {i}\right )\,1{}\mathrm {i}}{2}-\sqrt {1-x^2}\,1{}\mathrm {i}}{x-\mathrm {i}}\right )\,1{}\mathrm {i}}{2}-\frac {\sqrt {2}\,\ln \left (\frac {\frac {\sqrt {2}\,\left (1+x\,1{}\mathrm {i}\right )\,1{}\mathrm {i}}{2}+\sqrt {1-x^2}\,1{}\mathrm {i}}{x+1{}\mathrm {i}}\right )\,1{}\mathrm {i}}{2} \]
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