1 1
/ /
| |
| x | x
| ------ dx = | ------ dx
| sin(x) | sin(x)
| |
/ /
0 0
$${{i\,\pi^2}\over{4}}-{{2\,i\,\arctan \left({{\sin 1}\over{\cos 1+1
}}\right)-2\,i\,\arctan \left({{\sin 1}\over{\cos 1-1}}\right)+\log
\left(2\,\cos 1+2\right)-\log \left(2-2\,\cos 1\right)+2\,i\,
{\it li}_{2}(e^{i})-2\,i\,{\it li}_{2}(-e^{i})}\over{2}}$$
Ответ (Неопределённый)
[src]$$-{{x\,\log \left(\sin ^2x+\cos ^2x+2\,\cos x+1\right)-x\,\log
\left(\sin ^2x+\cos ^2x-2\,\cos x+1\right)+2\,i\,x\,{\rm atan2}
\left(\sin x , \cos x+1\right)+2\,i\,x\,{\rm atan2}\left(\sin x , 1-
\cos x\right)+2\,i\,{\it li}_{2}(e^{i\,x})-2\,i\,{\it li}_{2}(-e^{i
\,x})}\over{2}}$$