Online HelpPC 2.10      Quick Reference Utility     Copyright 1991 David Jurgens

 
                           double acos( double x )                           
                                                                                
                                                                                
        - prototype in math.h                                                   
                                                                                
        - returns arc cosine of x                                               
        - values must be in range -1 to 1                                       
                                                                                
                                                                                
 

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