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A precise measurement of the vector and axial-vector form factors difference$F_V-F_A$ in the $K^+\rightarrow{\mu^+}{\nu_{\mu}}{\gamma}$ decay is presented.About 95K events of $K^+\rightarrow{\mu^+}{\nu_{\mu}}{\gamma}$ are selected inthe OKA experiment. The result is $F_V-F_A=0.134\pm0.021(stat)\pm0.027(syst)$.Both errors are smaller than in the previous $F_V-F_A$ measurements.

Measurement of the $K^+\rightarrow{\mu^+}{\nu_{\mu}}{\gamma}$ decay form factors in the OKA experiment