Integrand size = 13, antiderivative size = 188 \[ \int \frac {x \cot ^{-1}(c x)}{1+x^2} \, dx=-\cot ^{-1}(c x) \log \left (\frac {2}{1-i c x}\right )+\frac {1}{2} \cot ^{-1}(c x) \log \left (\frac {2 i c (i-x)}{(1-c) (1-i c x)}\right )+\frac {1}{2} \cot ^{-1}(c x) \log \left (-\frac {2 i c (i+x)}{(1+c) (1-i c x)}\right )-\frac {1}{2} i \operatorname {PolyLog}\left (2,1-\frac {2}{1-i c x}\right )+\frac {1}{4} i \operatorname {PolyLog}\left (2,1-\frac {2 i c (i-x)}{(1-c) (1-i c x)}\right )+\frac {1}{4} i \operatorname {PolyLog}\left (2,1+\frac {2 i c (i+x)}{(1+c) (1-i c x)}\right ) \]
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Time = 0.14 (sec) , antiderivative size = 188, normalized size of antiderivative = 1.00, number of steps used = 10, number of rules used = 5, \(\frac {\text {number of rules}}{\text {integrand size}}\) = 0.385, Rules used = {5049, 4967, 2449, 2352, 2497} \[ \int \frac {x \cot ^{-1}(c x)}{1+x^2} \, dx=-\frac {1}{2} i \operatorname {PolyLog}\left (2,1-\frac {2}{1-i c x}\right )+\frac {1}{4} i \operatorname {PolyLog}\left (2,1-\frac {2 i c (i-x)}{(1-c) (1-i c x)}\right )+\frac {1}{4} i \operatorname {PolyLog}\left (2,\frac {2 i c (x+i)}{(c+1) (1-i c x)}+1\right )+\log \left (\frac {2}{1-i c x}\right ) \left (-\cot ^{-1}(c x)\right )+\frac {1}{2} \log \left (\frac {2 i c (-x+i)}{(1-c) (1-i c x)}\right ) \cot ^{-1}(c x)+\frac {1}{2} \log \left (-\frac {2 i c (x+i)}{(c+1) (1-i c x)}\right ) \cot ^{-1}(c x) \]
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Rule 2352
Rule 2449
Rule 2497
Rule 4967
Rule 5049
Rubi steps \begin{align*} \text {integral}& = \int \left (-\frac {\cot ^{-1}(c x)}{2 (i-x)}+\frac {\cot ^{-1}(c x)}{2 (i+x)}\right ) \, dx \\ & = -\left (\frac {1}{2} \int \frac {\cot ^{-1}(c x)}{i-x} \, dx\right )+\frac {1}{2} \int \frac {\cot ^{-1}(c x)}{i+x} \, dx \\ & = -\cot ^{-1}(c x) \log \left (\frac {2}{1-i c x}\right )+\frac {1}{2} \cot ^{-1}(c x) \log \left (\frac {2 i c (i-x)}{(1-c) (1-i c x)}\right )+\frac {1}{2} \cot ^{-1}(c x) \log \left (-\frac {2 i c (i+x)}{(1+c) (1-i c x)}\right )-2 \left (\frac {1}{2} c \int \frac {\log \left (\frac {2}{1-i c x}\right )}{1+c^2 x^2} \, dx\right )+\frac {1}{2} c \int \frac {\log \left (\frac {2 c (i-x)}{(-i+i c) (1-i c x)}\right )}{1+c^2 x^2} \, dx+\frac {1}{2} c \int \frac {\log \left (\frac {2 c (i+x)}{(i+i c) (1-i c x)}\right )}{1+c^2 x^2} \, dx \\ & = -\cot ^{-1}(c x) \log \left (\frac {2}{1-i c x}\right )+\frac {1}{2} \cot ^{-1}(c x) \log \left (\frac {2 i c (i-x)}{(1-c) (1-i c x)}\right )+\frac {1}{2} \cot ^{-1}(c x) \log \left (-\frac {2 i c (i+x)}{(1+c) (1-i c x)}\right )+\frac {1}{4} i \operatorname {PolyLog}\left (2,1-\frac {2 i c (i-x)}{(1-c) (1-i c x)}\right )+\frac {1}{4} i \operatorname {PolyLog}\left (2,1+\frac {2 i c (i+x)}{(1+c) (1-i c x)}\right )-2 \left (\frac {1}{2} i \text {Subst}\left (\int \frac {\log (2 x)}{1-2 x} \, dx,x,\frac {1}{1-i c x}\right )\right ) \\ & = -\cot ^{-1}(c x) \log \left (\frac {2}{1-i c x}\right )+\frac {1}{2} \cot ^{-1}(c x) \log \left (\frac {2 i c (i-x)}{(1-c) (1-i c x)}\right )+\frac {1}{2} \cot ^{-1}(c x) \log \left (-\frac {2 i c (i+x)}{(1+c) (1-i c x)}\right )-\frac {1}{2} i \operatorname {PolyLog}\left (2,1-\frac {2}{1-i c x}\right )+\frac {1}{4} i \operatorname {PolyLog}\left (2,1-\frac {2 i c (i-x)}{(1-c) (1-i c x)}\right )+\frac {1}{4} i \operatorname {PolyLog}\left (2,1+\frac {2 i c (i+x)}{(1+c) (1-i c x)}\right ) \\ \end{align*}
Time = 1.42 (sec) , antiderivative size = 309, normalized size of antiderivative = 1.64 \[ \int \frac {x \cot ^{-1}(c x)}{1+x^2} \, dx=\frac {1}{2} \left (-i \cot ^{-1}(c x)^2-2 i \arcsin \left (\sqrt {\frac {1}{1-c^2}}\right ) \arctan \left (\frac {\sqrt {c^2}}{c x}\right )-2 \cot ^{-1}(c x) \log \left (1-e^{2 i \cot ^{-1}(c x)}\right )+\left (\cot ^{-1}(c x)-\arcsin \left (\sqrt {\frac {1}{1-c^2}}\right )\right ) \log \left (\frac {-1+\left (-1+2 \sqrt {c^2}\right ) e^{2 i \cot ^{-1}(c x)}-c^2 \left (-1+e^{2 i \cot ^{-1}(c x)}\right )}{-1+c^2}\right )+\left (\cot ^{-1}(c x)+\arcsin \left (\sqrt {\frac {1}{1-c^2}}\right )\right ) \log \left (-\frac {1+\left (1+2 \sqrt {c^2}\right ) e^{2 i \cot ^{-1}(c x)}+c^2 \left (-1+e^{2 i \cot ^{-1}(c x)}\right )}{-1+c^2}\right )+i \left (\cot ^{-1}(c x)^2+\operatorname {PolyLog}\left (2,e^{2 i \cot ^{-1}(c x)}\right )\right )-\frac {1}{2} i \left (\operatorname {PolyLog}\left (2,\frac {\left (1+c^2-2 \sqrt {c^2}\right ) e^{2 i \cot ^{-1}(c x)}}{-1+c^2}\right )+\operatorname {PolyLog}\left (2,\frac {\left (1+c^2+2 \sqrt {c^2}\right ) e^{2 i \cot ^{-1}(c x)}}{-1+c^2}\right )\right )\right ) \]
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Result contains higher order function than in optimal. Order 9 vs. order 4.
Time = 0.76 (sec) , antiderivative size = 134, normalized size of antiderivative = 0.71
method | result | size |
parts | \(\frac {\ln \left (x^{2}+1\right ) \operatorname {arccot}\left (c x \right )}{2}+\frac {\munderset {\underline {\hspace {1.25 ex}}\alpha =\operatorname {RootOf}\left (\textit {\_Z}^{2} c^{2}+1\right )}{\sum }\frac {\ln \left (x -\underline {\hspace {1.25 ex}}\alpha \right ) \ln \left (x^{2}+1\right )-\ln \left (x -\underline {\hspace {1.25 ex}}\alpha \right ) \ln \left (\frac {c \underline {\hspace {1.25 ex}}\alpha +x}{\underline {\hspace {1.25 ex}}\alpha \left (1+c \right )}\right )-\ln \left (x -\underline {\hspace {1.25 ex}}\alpha \right ) \ln \left (\frac {c \underline {\hspace {1.25 ex}}\alpha -x}{\underline {\hspace {1.25 ex}}\alpha \left (c -1\right )}\right )-\operatorname {dilog}\left (\frac {c \underline {\hspace {1.25 ex}}\alpha +x}{\underline {\hspace {1.25 ex}}\alpha \left (1+c \right )}\right )-\operatorname {dilog}\left (\frac {c \underline {\hspace {1.25 ex}}\alpha -x}{\underline {\hspace {1.25 ex}}\alpha \left (c -1\right )}\right )}{\underline {\hspace {1.25 ex}}\alpha }}{4 c}\) | \(134\) |
risch | \(\frac {\pi \ln \left (-c^{2}+\left (-i c x +1\right )^{2}-1+2 i c x \right )}{4}-\frac {i \operatorname {dilog}\left (\frac {-i c x -c}{-c -1}\right )}{4}-\frac {i \ln \left (-i c x +1\right ) \ln \left (\frac {-i c x -c}{-c -1}\right )}{4}-\frac {i \operatorname {dilog}\left (\frac {-i c x +c}{c -1}\right )}{4}-\frac {i \ln \left (-i c x +1\right ) \ln \left (\frac {-i c x +c}{c -1}\right )}{4}+\frac {i \ln \left (i c x +1\right ) \ln \left (\frac {i c x -c}{-c -1}\right )}{4}+\frac {i \operatorname {dilog}\left (\frac {i c x -c}{-c -1}\right )}{4}+\frac {i \ln \left (i c x +1\right ) \ln \left (\frac {i c x +c}{c -1}\right )}{4}+\frac {i \operatorname {dilog}\left (\frac {i c x +c}{c -1}\right )}{4}\) | \(211\) |
derivativedivides | \(\frac {\frac {c^{2} \ln \left (c^{2} x^{2}+c^{2}\right ) \operatorname {arccot}\left (c x \right )}{2}+\frac {c^{2} \left (-\frac {i \left (\ln \left (c x -i\right ) \ln \left (c^{2} x^{2}+c^{2}\right )-i \left (-i \operatorname {dilog}\left (\frac {i \left (c x -i\right )+c -1}{c -1}\right )-i \ln \left (c x -i\right ) \ln \left (\frac {i \left (c x -i\right )+c -1}{c -1}\right )\right )-i \left (-i \operatorname {dilog}\left (\frac {i \left (c x -i\right )-c -1}{-c -1}\right )-i \ln \left (c x -i\right ) \ln \left (\frac {i \left (c x -i\right )-c -1}{-c -1}\right )\right )\right )}{2}+\frac {i \left (\ln \left (c x +i\right ) \ln \left (c^{2} x^{2}+c^{2}\right )+i \left (i \operatorname {dilog}\left (\frac {-i \left (c x +i\right )+c -1}{c -1}\right )+i \ln \left (c x +i\right ) \ln \left (\frac {-i \left (c x +i\right )+c -1}{c -1}\right )\right )+i \left (i \operatorname {dilog}\left (\frac {-i \left (c x +i\right )-c -1}{-c -1}\right )+i \ln \left (c x +i\right ) \ln \left (\frac {-i \left (c x +i\right )-c -1}{-c -1}\right )\right )\right )}{2}\right )}{2}}{c^{2}}\) | \(317\) |
default | \(\frac {\frac {c^{2} \ln \left (c^{2} x^{2}+c^{2}\right ) \operatorname {arccot}\left (c x \right )}{2}+\frac {c^{2} \left (-\frac {i \left (\ln \left (c x -i\right ) \ln \left (c^{2} x^{2}+c^{2}\right )-i \left (-i \operatorname {dilog}\left (\frac {i \left (c x -i\right )+c -1}{c -1}\right )-i \ln \left (c x -i\right ) \ln \left (\frac {i \left (c x -i\right )+c -1}{c -1}\right )\right )-i \left (-i \operatorname {dilog}\left (\frac {i \left (c x -i\right )-c -1}{-c -1}\right )-i \ln \left (c x -i\right ) \ln \left (\frac {i \left (c x -i\right )-c -1}{-c -1}\right )\right )\right )}{2}+\frac {i \left (\ln \left (c x +i\right ) \ln \left (c^{2} x^{2}+c^{2}\right )+i \left (i \operatorname {dilog}\left (\frac {-i \left (c x +i\right )+c -1}{c -1}\right )+i \ln \left (c x +i\right ) \ln \left (\frac {-i \left (c x +i\right )+c -1}{c -1}\right )\right )+i \left (i \operatorname {dilog}\left (\frac {-i \left (c x +i\right )-c -1}{-c -1}\right )+i \ln \left (c x +i\right ) \ln \left (\frac {-i \left (c x +i\right )-c -1}{-c -1}\right )\right )\right )}{2}\right )}{2}}{c^{2}}\) | \(317\) |
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\[ \int \frac {x \cot ^{-1}(c x)}{1+x^2} \, dx=\int { \frac {x \operatorname {arccot}\left (c x\right )}{x^{2} + 1} \,d x } \]
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\[ \int \frac {x \cot ^{-1}(c x)}{1+x^2} \, dx=\int \frac {x \operatorname {acot}{\left (c x \right )}}{x^{2} + 1}\, dx \]
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\[ \int \frac {x \cot ^{-1}(c x)}{1+x^2} \, dx=\int { \frac {x \operatorname {arccot}\left (c x\right )}{x^{2} + 1} \,d x } \]
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\[ \int \frac {x \cot ^{-1}(c x)}{1+x^2} \, dx=\int { \frac {x \operatorname {arccot}\left (c x\right )}{x^{2} + 1} \,d x } \]
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Timed out. \[ \int \frac {x \cot ^{-1}(c x)}{1+x^2} \, dx=\int \frac {x\,\mathrm {acot}\left (c\,x\right )}{x^2+1} \,d x \]
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