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   39 #ifndef WCSLIB_WCSMATH 
   40 #define WCSLIB_WCSMATH 
   62 #define PI 3.141592653589793238462643 
   65 #define SQRT2 1.4142135623730950488 
   66 #define SQRT2INV 1.0/SQRT2 
   72 #define UNDEFINED 987654321.0e99 
   73 #define undefined(value) (value == UNDEFINED)