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COS                      Cosine

 y = COS(numexpr)

    Returns the cosine of the angle whose value, in radians, is expressed
    in numexpr. The value is returned in double precision.

     numexpr    A numeric expression.

   -------------------------------------------------------------------------

      Notes:    Remember that 2. radians is equal to 360 degrees.
                Therefore 1 radian is equal to 180/..

See Also: ATN SIN TAN

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