Integrand size = 15, antiderivative size = 20 \[ \int \frac {1}{x \sqrt {16-x^4}} \, dx=-\frac {1}{8} \text {arctanh}\left (\frac {\sqrt {16-x^4}}{4}\right ) \]
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Time = 0.01 (sec) , antiderivative size = 20, normalized size of antiderivative = 1.00, number of steps used = 3, number of rules used = 3, \(\frac {\text {number of rules}}{\text {integrand size}}\) = 0.200, Rules used = {272, 65, 212} \[ \int \frac {1}{x \sqrt {16-x^4}} \, dx=-\frac {1}{8} \text {arctanh}\left (\frac {\sqrt {16-x^4}}{4}\right ) \]
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Rule 65
Rule 212
Rule 272
Rubi steps \begin{align*} \text {integral}& = \frac {1}{4} \text {Subst}\left (\int \frac {1}{\sqrt {16-x} x} \, dx,x,x^4\right ) \\ & = -\left (\frac {1}{2} \text {Subst}\left (\int \frac {1}{16-x^2} \, dx,x,\sqrt {16-x^4}\right )\right ) \\ & = -\frac {1}{8} \tanh ^{-1}\left (\frac {\sqrt {16-x^4}}{4}\right ) \\ \end{align*}
Time = 0.02 (sec) , antiderivative size = 20, normalized size of antiderivative = 1.00 \[ \int \frac {1}{x \sqrt {16-x^4}} \, dx=-\frac {1}{8} \text {arctanh}\left (\frac {\sqrt {16-x^4}}{4}\right ) \]
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Time = 4.23 (sec) , antiderivative size = 15, normalized size of antiderivative = 0.75
method | result | size |
default | \(-\frac {\operatorname {arctanh}\left (\frac {4}{\sqrt {-x^{4}+16}}\right )}{8}\) | \(15\) |
elliptic | \(-\frac {\operatorname {arctanh}\left (\frac {4}{\sqrt {-x^{4}+16}}\right )}{8}\) | \(15\) |
pseudoelliptic | \(-\frac {\operatorname {arctanh}\left (\frac {4}{\sqrt {-x^{4}+16}}\right )}{8}\) | \(15\) |
trager | \(\frac {\ln \left (\frac {\sqrt {-x^{4}+16}-4}{x^{2}}\right )}{8}\) | \(19\) |
meijerg | \(\frac {\left (-6 \ln \left (2\right )+4 \ln \left (x \right )+i \pi \right ) \sqrt {\pi }-2 \sqrt {\pi }\, \ln \left (\frac {1}{2}+\frac {\sqrt {1-\frac {x^{4}}{16}}}{2}\right )}{16 \sqrt {\pi }}\) | \(43\) |
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Leaf count of result is larger than twice the leaf count of optimal. 29 vs. \(2 (14) = 28\).
Time = 0.26 (sec) , antiderivative size = 29, normalized size of antiderivative = 1.45 \[ \int \frac {1}{x \sqrt {16-x^4}} \, dx=-\frac {1}{16} \, \log \left (\sqrt {-x^{4} + 16} + 4\right ) + \frac {1}{16} \, \log \left (\sqrt {-x^{4} + 16} - 4\right ) \]
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Result contains complex when optimal does not.
Time = 0.50 (sec) , antiderivative size = 26, normalized size of antiderivative = 1.30 \[ \int \frac {1}{x \sqrt {16-x^4}} \, dx=\begin {cases} - \frac {\operatorname {acosh}{\left (\frac {4}{x^{2}} \right )}}{8} & \text {for}\: \frac {1}{\left |{x^{4}}\right |} > \frac {1}{16} \\\frac {i \operatorname {asin}{\left (\frac {4}{x^{2}} \right )}}{8} & \text {otherwise} \end {cases} \]
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Leaf count of result is larger than twice the leaf count of optimal. 29 vs. \(2 (14) = 28\).
Time = 0.20 (sec) , antiderivative size = 29, normalized size of antiderivative = 1.45 \[ \int \frac {1}{x \sqrt {16-x^4}} \, dx=-\frac {1}{16} \, \log \left (\sqrt {-x^{4} + 16} + 4\right ) + \frac {1}{16} \, \log \left (\sqrt {-x^{4} + 16} - 4\right ) \]
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Leaf count of result is larger than twice the leaf count of optimal. 31 vs. \(2 (14) = 28\).
Time = 0.27 (sec) , antiderivative size = 31, normalized size of antiderivative = 1.55 \[ \int \frac {1}{x \sqrt {16-x^4}} \, dx=-\frac {1}{16} \, \log \left (\sqrt {-x^{4} + 16} + 4\right ) + \frac {1}{16} \, \log \left (-\sqrt {-x^{4} + 16} + 4\right ) \]
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Time = 5.63 (sec) , antiderivative size = 14, normalized size of antiderivative = 0.70 \[ \int \frac {1}{x \sqrt {16-x^4}} \, dx=-\frac {\mathrm {atanh}\left (\frac {\sqrt {16-x^4}}{4}\right )}{8} \]
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