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Three problems about recovery of a high-frequency free term in theone-dimension wave equation with homogeneous initial-boundary conditions bysome information about partial asymptotics of its solution have been solved. Itis shoun, that the free term can be completely recovered from a specific dataabout incomplete (three-terms) asymptotics of the solution. Before formulationof the each problem about recovery of free term, construction and justificationof the asymptotics of the solution of original initial-boundary problem aregiven.

Recovery of a fast oscillating free term in the wave equation by asymptotics of the solution