Cut cut cut

Geometry Level 3

If $\cot \theta \ \sqrt{1 - \cos^2\theta} = 1$ and $\theta = [0^\circ,360^\circ)$

Find the solution set of $\theta$ .

x = {0} x = {180} x = {0,180} x={270} x = {90} None of the choices x = {90,270}