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y = ¹/₂(1 - cos 2x)
..
x= 0 --> y = ¹/₂ ( 1- cos 0) = 0
x = ¹/₂ π --> y = ¹/₂ ( 1 - cos π) = ¹/₂ (1- (-1))= 1
x = π --> y = ¹/₂ (1 - cos 2π) = ¹/₂( 1 - 1) = 0