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with(linalg):M := array([[4*m, 0, 0], [0, 2*m, 0], [0, 0, m]]);
K := array([[4*k, -k, 0], [-k, 2*k, -k], [0, -k, k]]);
Q := matadd(-omega2*M, K);
eqn := det(Q) = 0;
solve(eqn, omega2);

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