function [ Hs2, yft2, Hdz2, Ac, Bc, Cc ] = lab4(A2, B2, C2)
    syms h;
    syms z;
    syms s;
    syms tau;
    syms t;
    syms k;
    [n n]=size(A2);
    X = inv(s * eye(n) - A2);
    Hs2 = simplify(C2 * X * B2);
    yfs2=Hs2*1/s;
    yft2=ilaplace(yfs2,t);
    Hdz2 = simplify((z - 1)/ z * ztrans(ilaplace((Hs2 / s),s,k*h)));

    [N, D] = numden(Hdz2);
    beta = coeffs(N, z);
    alfa = coeffs(D, z);
    beta=beta/alfa(1);
    Ac = [0*eye(2) 1*eye(2); -alfa(3)*eye(2) -alfa(2)*eye(2)];
    Bc = [0*eye(2); 1*eye(2)];
    Cc = [beta(2)*eye(2) beta(1)*eye(2)];

end