- (a) Show that
$$\frac { \sin 2 \theta } { 1 + \cos 2 \theta } = \tan \theta$$
(b) Hence find, for \(- 180 ^ { \circ } \leqslant \theta < 180 ^ { \circ }\), all the solutions of
$$\frac { 2 \sin 2 \theta } { 1 + \cos 2 \theta } = 1$$
Give your answers to 1 decimal place.