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The widely known problems, where hidden oscillations exist, are discussed: Hilberts 16-th problem, Kolmogorovs problem, Aizerman and Kalman conjectures.The effective methods of search of hidden oscillations are described: the method of asymptotical integration of solutions of Lienard equation together with algorithms of numerical computation of Lyapunov quantities and a special method of harmonic Linearization united with the applied theory of bifurcations.