1 1
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| x*cot(x) dx = | x*cot(x) dx
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0 0
$$i\,\arctan \left({{\sin 1}\over{\cos 1+1}}\right)+i\,\arctan \left(
{{\sin 1}\over{\cos 1-1}}\right)+{{\log \left(2\,\cos 1+2\right)
}\over{2}}+{{\log \left(2-2\,\cos 1\right)}\over{2}}-i\,{\it li}_{2}
(e^{i})-i\,{\it li}_{2}(-e^{i})+{{i\,\pi^2}\over{12}}-{{i}\over{2}}$$
Ответ (Неопределённый)
[src]$${{x\,\log \left(\sin ^2x+\cos ^2x+2\,\cos x+1\right)+x\,\log \left(
\sin ^2x+\cos ^2x-2\,\cos x+1\right)+2\,i\,x\,{\rm atan2}\left(\sin
x , \cos x+1\right)-2\,i\,x\,{\rm atan2}\left(\sin x , 1-\cos x
\right)-2\,i\,{\it li}_{2}(e^{i\,x})-2\,i\,{\it li}_{2}(-e^{i\,x})-i
\,x^2}\over{2}}$$