function dydt = stiff_deriv ( t, y )

%*****************************************************************************80
%
%% stiff_deriv() evaluates the right hand side of the stiff ODE.
%
%  Licensing:
%
%    This code is distributed under the MIT license.
%
%  Modified:
%
%    07 February 2020
%
%  Author:
%
%    John Burkardt
%
%  Input:
%
%    real T(:), Y(:), the arguments of the derivative.
%
%  Output:
%
%    real DYDT(:), the value of the derivative.
%
  dydt = 50.0 * ( cos ( t ) - y );

  return
end

