1 1
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| 2 | 2
| x *tan(x) dx = | x *tan(x) dx
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0 0
$$-i\,\arctan \left({{\sin 2}\over{\cos 2+1}}\right)-{{\log \left(2\,
\cos 2+2\right)}\over{2}}-{{{\it li}_{3}(-e^{2\,i})}\over{2}}+i\,
{\it li}_{2}(-e^{2\,i})-{{3\,\zeta\left(3\right)}\over{8}}+{{i
}\over{3}}$$
Ответ (Неопределённый)
[src]$$-{{3\,x^2\,\log \left(\sin ^2\left(2\,x\right)+\cos ^2\left(2\,x
\right)+2\,\cos \left(2\,x\right)+1\right)+6\,i\,x^2\,{\rm atan2}
\left(\sin \left(2\,x\right) , \cos \left(2\,x\right)+1\right)+3\,
{\it li}_{3}(-e^{2\,i\,x})-6\,i\,x\,{\it li}_{2}(-e^{2\,i\,x})-2\,i
\,x^3}\over{6}}$$