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COS returns the cosine of angle x.
 
COS(x)
    ■ The argument x can be of any numeric type.
 
Usage Notes
    ■ The cosine of an angle in a right triangle is the ratio between the
      length of the side adjacent to the angle and the length of the
      hypotenuse.
    ■ COS is calculated in single precision if the argument x is an
      integer or single-precision value. If you use any other numeric data
      type, COS is calculated in double-precision.
    ■ To convert values from degrees to radians, multiply the angle
      (in degrees) times PI/180 (or .0174532925199433) where PI = 3.141593.
    ■ To convert a radian value to degrees, multiply it by 180/PI
      (or 57.2957795130824) where PI = 3.141593.