Mathematics

Problem

P = {\theta : \sin \theta - \cos \theta = \sqrt{2} \cos \theta}

and

Q = {\theta : \sin \theta + \cos \theta = \sqrt{2} \sin \theta}

be two sets, then, a.

P \subset Q

and

Q - P \neq \emptyset

Q \subset P

P \not\subset Q

P = Q