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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