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function dy = wyj(x, y)
   dy = [y(2); (1-2.45*cos(y(1))-2*y(2))/0.0469];

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>>tspan=[0 10];
>>y0=[0 1];
>>options=odeset('RelTol', 1e-4, 'AbsTol', [1e-4 1e-4]);
>>[x, y]=ode45(@wyj, tspan, y0, options);

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