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= √(2 + √(2+2cos² 2θ - 2sin² 2θ))
= √(2 + √(4.cos² 2θ))
= √(2 + 2cos 2θ)
= √(2 + 2cos² θ - 2sin² θ)
= √4cos² θ
= 2cos θ.................opsi D