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sorrylolita

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tao = 1;
k = 1;
kd = 0.26;
theta = 1;

syms  ki kp

A = 10^(1/4);phi = 0;
k0 = 10^(1/4);
f1 = sqrt((1+2*k0^2*ki*kd-k0^2*kp^2)^2+4*k0^2*ki^2*(tao^2-k0^2*kd^2));
w = sqrt((k0^2*kp^2-2*k0^2*ki*kd-1+f1)/(2*(tao^2-k0^2*kd^2)));
D = (tao^2+A^2*k^2*kd^2)*w^4+(1-2*A^2*k^2*ki*kd+A^2*k^2*kp^2)*w^2+A^2*k^2*ki^2-2*(tao*A*k*ki*w^2-A*k*kp*w^2-A*tao*k*kd*w^4)*cos(theta*w+phi)+(-A*tao*k*kp*w^3+2*A*k*kd*w^3-2*A*k*ki*w)*sin(theta*w+phi)

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