Ответ (Неопределённый)
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| log(-1 + cos(x)) log(1 + cos(x))
| sin(x)*log(tan(x)) dx = C + ---------------- - --------------- - cos(x)*log(tan(x))
| 2 2
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$$4\,\left({{2\,\log \left({{\sin x}\over{\cos x+1}}\right)-\log
\left({{\sin ^2x}\over{\left(\cos x+1\right)^2}}-1\right)}\over{4}}-
{{\log \left({{2\,\sin x}\over{\left(\cos x+1\right)\,\left(1-{{
\sin ^2x}\over{\left(\cos x+1\right)^2}}\right)}}\right)}\over{2\,
\left({{\sin ^2x}\over{\left(\cos x+1\right)^2}}+1\right)}}\right)$$