arc cosine
noun
            variants  
 or arccosine
        
    
            
               plural arc cosines or arccosines            
        
    
                                
              
          
                                                      : the inverse function of the cosine                                      
              
                             
if y is the cosine of θ, then θ is the arccosine of y
                         
                
                  —abbreviation arccos
    
                
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  Merriam-Webster unabridged




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