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function v = ddex1de(t,y,Z)
ylag1 = Z(:,1);
v = zeros(8,1);
t1=3;a=3;r=1;rs=50;ra=0.1;rp=6;k=300;dw=0.0;u=1.2;wm=2;f=6;g=6;
v(1)=k*(1+i*a)*((y(5)-1)*y(1)+i*y(7)*y(2))-(ra+i*rp)*y(1)+f*ylag1(1)*exp(i*wm*t1)*exp(i*G1);

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