HP 3000 Manuals

HP COBOL II/XL Quick Reference Guide

ACOS 

The ACOS function returns the arccosine of the parameter.  The function
type is numeric.

Syntax 

     FUNCTION ACOS (parameter-1)

Parameters 

parameter-1           Must be class numeric and must be between -1 and 1,
                      inclusive.

MPE/iX 5.0 Documentation