(i) Show that the equation \(2 \tan^2 \theta \sin^2 \theta = 1\) can be written in the form \(2 \sin^4 \theta + \sin^2 \theta - 1 = 0\).

(ii) Hence solve the equation \(2 \tan^2 \theta \sin^2 \theta = 1\) for \(0^\circ \leq \theta \leq 360^\circ\).