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  Include:   <math.h>
 
  Syntax:    int matherr( struct exception *except );
             int _matherrl( struct _exceptionl *except );
 
  Returns:   a nonzero value if successful, or 0 if not.
 
  See also:  acos, asin, atan, atan2, bessel, cabs, cos, cosh, exp,
             hypot, log, pow, sin, sinh, sqrt, tan
                                    -♦-