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For a generic Higgs boson, measuring the relative sign and magnitude of its couplings with the W and Z bosons is essential in determining its origin. Such a test is also indispensable for the 125-GeV Higgs boson. We propose that the ratio of the HWW and HZZ couplings λ_WZ can be directly determined through the W^+W^-H production, where H denotes a generic Higgs boson, owing to the tree-level interference effect. While this is impractical at the LHC due to the limited sensitivity, it can be donedoi:10.1007/jhep08(2018)126 fatcat:h5e2lclc3vcmvf2xjluqsosqea