Let P = {θ∶ sin θ - cos θ = √2 cos θ} and Q = {θ∶ sin θ + cos θ = √2 sin θ} be two sets. Then:

1
P ⊂ Q and Q - P ≠ 0.
2
P ⊄ Q.
3
Q ⊄ P.
4
P = Q.

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