Evaluate: \(\smallint \dfrac{{\sin x}}{{\left( {1 -\ \cos x} \right)\;\left( {2 -\ \cos x} \right)}}dx\)
1
\(\rm \;\log \left| {\dfrac{{1 - \cos x}}{{2 - \cos x}}} \right| + C\)
2
\(\rm \;\log \left| {\dfrac{{2 - \sin x}}{{1 - \sin x}}} \right| + C\)
3
\(\rm \;\log \left| {\dfrac{{1 + \cos x}}{{2 + \cos x}}} \right| + C\)
4
\(\rm \;\ 2log \left| {\dfrac{{1 - \sin x}}{{2 - \sin x}}} \right| + C\)