function value = bill2 ( xy )

%*****************************************************************************80
%
%% bill2 evaluates the bill2 function.
%
%  Licensing:
%
%    This code is distributed under the GNU LGPL license.
%
%  Modified:
%
%    22 September 2019
%
%  Input:
%
%    real xy(2), the argument.
%
%  Output:
%
%    real value(2), the function value.
%
  x = xy(1);
  y = xy(2);

  value = [ ...
    x-y+sin(y); ...
    3.0*sin(x)-y ];

  return
end

