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function test
t=0:0.1:300;
[t,y]=ode45(@fun,t,[0 300]);
plot(t,y)
function dy=fun(t,y)
dy=zeros(2,1);
dy(1)=1+2*y(2);
dy(2)=3*(1-y(1)^2)*y(2)-y(1);

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