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7.1.3 ACOS
The ACOS function returns a numeric value in radians that approximates the arccosine of the argument specified.
The function type is numeric. 



    ___ Format _____________________________________________________________ 
   |                                                                        |
   | >>__FUNCTION ACOS__(argument-1)_____________________________________>< |
   |                                                                        |
   |________________________________________________________________________|
argument-1
Must be class numeric. The value of argument-1 must be greater than or equal to -1 and less than or equal to +1.
The returned value is the approximation of the arccosine of the argument and is greater than or equal to zero and less than or equal to Pi.

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