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function dy=f(t,y)
dy=zeros(2,1);
dy(1)=y(2);
dy(2)=7*(1-y(1)^2)*y(2)-y(1);
[t,y]=ode45('f',[0,40],[1;0])
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a=7
function dy=f(t,y)
dy=zeros(2,1);
dy(1)=y(2);
dy(2)=a.*(1-y(1)^2)*y(2)-y(1);
[t,y]=ode45('f',[0,40],[1;0])
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