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A simplified model of phase locking is discussed, which can be fully solved in analytical terms with no limitations as to the intensity of the coupling mechanism responsible for the locking. A nanomagnet with uniaxial symmetry is considered, jointly driven by a spin-polarized current, a dc magnetic field along the symmetry axis, and a radio-frequency circularly polarized magnetic field. The conditions are determined under which locking occurs between current-induced oscillations and the action of the rf field. The locking effect exhibits hysteresis as a function of the current.