Question

Sin theata/1+cos theata=tan theata/2

Answer 1

$\frac{sin \theta}{1 + cos \theta} \\ = \frac{2sin \frac{ \theta}{2} cos \frac{ \theta}{2} }{2 {cos}^{2} \frac{ \theta}{2} } \\ = \frac{sin \frac{ \theta}{2} }{cos \frac{ \theta}{2} } \\ = tan \frac{ \theta}{2}$