ACOSR()
 To return the ARCCOSINE in radians of a cosine value.
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 Syntax

      ACOSR( <nCos> ) -> nRadian

 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

      ACOSR() returns the arccosine value (reverse cosign) in radians of
      <nCos>.

 Description

      ACOSR() is a trigonometrical function that returns the arccosine value
      in radians of a cosine value.

      For degrees, see ACOS().

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

 Examples

      ? Str( ACOSR(.707106781), 8,  6)  // returns 0.785398
      ? Str( ACOSR(.866025403), 8,  6)  // returns 0.523599

 Files: CALC.LIB

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