[continued from previous message]   
      
       style="white-space: pre-wrap">°, it has a rational sine (0.5) that can   
   also be represented exactly in IEEE floating point. The cosine of   
   30°, as I'm sure you know, is (in Fortran)   
   sqrt(3.0) / 2.0, which is irrational and not as obviously correct or incorrect   
   as the sine of 30°.   
      
   Louis   
      
      
      
      
      
        
      
      
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