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  1. @c ----------------------------------------------------------------------
  2. @node atan2, math
  3. @subheading Syntax
  4.  
  5. @example
  6. #include <math.h>
  7.  
  8. double atan2(double y, double x);
  9. @end example
  10.  
  11. @subheading Return Value
  12.  
  13. The arc tangent of @var{y/x}, with appropriate return values for
  14. @var{y}=0 or @var{x}=0.
  15.