ACOS()
 To return the ARCCOSINE in degrees of a cosine value.
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 Syntax

      ACOS( <nCos> ) -> nDegree

 Arguments

      <nCos> is a numeric value representing a cosine value.

      NOTE: Since a parameter of greater than 1 result in a math overflow,
            this function returns 0 as a result instead of a math overflow.

 Returns

      ACOS() returns the arccosine value (reverse cosine) in degrees of
      <nCos>.

 Description

      ACOS() is a trigonometrical function that returns the arccosine value
      in degrees of a cosine value.

      For radians, see ACOSR().

      Accuracy is to the twelfth decimal (i.e. .00000000001)

 Examples

      ? Str( ACOS(.707106781), 5,  2)  // returns 45.00
      ? Str( ACOS(.866025403), 5,  2)  // returns 30.00

 Files: CALC.LIB

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