cos(0) = 1

cos(30) = √3/2

cos(45) = 1/√2

cos(60) = 1/2

cos(90) = 0

cos(120) = -1/2

cos(135) = -1/√2

cos(150) = -√3/2

cos(180) = -1

cos(210) = -√3/2

cos(225) = -1/√2

cos(240) = -1/2

cos(270) = 0

cos(300) = 1/2

cos(315) = 1/√2

cos(330) = √3/2

cos(360) = 1

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