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cos^2 ϴ = 2 sin^2 ϴ
tan^2 ϴ = 1/2
tan ϴ = √1/2 = 1/√2
sin ϴ = 1/√3
y = A sin ϴ
y = 2 . 1/√3
y = 2/√3 cm = 2/3 √3 cm