Abstract
The problem or an approximate determination of unknown coefficients containing in the mathematical model equation or a real linear distributed parameter system of the 2nd order with two independent variables on a rectangular domain is considered. For the most complicated case when the unknown coefficients are functions of independent variables the effective method of their approximate determination is worked out. The method is based upon application of double Fourier-Chebyshev expansions. A computing scheme and a test results are stated.
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