\frac { \sin 2 \theta } { 1 + \cos 2 \theta } \cdot \frac { \cos \thet – InterviewSolution

1.	\frac { \sin 2 \theta } { 1 + \cos 2 \theta } \cdot \frac { \cos \theta } { 1 + \cos \theta } = \tan \theta / 2
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