et is a root of the characteristic equation Then for this root the angle condition can be written as K =-∠s1-∠(s1+2)=-180 s(s+2 =51 s+2 2022-2-3 72022-2-3 7 Let is a root of the characteristic equation. Then for this root, the angle condition can be written as     1 1 1 2 180 2 s s K s s s s           