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| x*cot(2*x) dx = | x*cot(2*x) dx
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$${{i\,\arctan \left({{\sin 2}\over{\cos 2+1}}\right)}\over{2}}+{{i\,
\arctan \left({{\sin 2}\over{\cos 2-1}}\right)}\over{2}}+{{\log
\left(2\,\cos 2+2\right)}\over{4}}+{{\log \left(2-2\,\cos 2\right)
}\over{4}}-{{i\,{\it li}_{2}(e^{2\,i})}\over{4}}-{{i\,{\it li}_{2}(-
e^{2\,i})}\over{4}}+{{i\,\pi^2}\over{48}}+{{i\,\pi}\over{2}}-{{i
}\over{2}}$$
Ответ (Неопределённый)
[src]$${{2\,x\,\log \left(\sin ^2\left(2\,x\right)+\cos ^2\left(2\,x
\right)+2\,\cos \left(2\,x\right)+1\right)+2\,x\,\log \left(\sin ^2
\left(2\,x\right)+\cos ^2\left(2\,x\right)-2\,\cos \left(2\,x\right)
+1\right)+4\,i\,x\,{\rm atan2}\left(\sin \left(2\,x\right) , \cos
\left(2\,x\right)+1\right)-4\,i\,x\,{\rm atan2}\left(\sin \left(2\,x
\right) , 1-\cos \left(2\,x\right)\right)-2\,i\,{\it li}_{2}(e^{2\,i
\,x})-2\,i\,{\it li}_{2}(-e^{2\,i\,x})-4\,i\,x^2}\over{8}}$$