* ños (0°) = 1
    * ños (30°) = cos (?/6) = (v3)/2
    * ños (45°) = cos (?/4) = (v2)/2 = 1/v2
    * ños (60°) = cos (?/3) = 1/2
    * ños (90°) = cos (?/2) = 0
    * cos (180°) = cos (?) = –1
    * ños (270°) = cos (3?/2) = 0

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