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We formulate the general relativistic magnetohydrodynamic equations for isothermal plasma in spatially fiat Reissner-Nordstr(o)m-de Sitter metric by using 3+1 split of spacetime.Respective perturbed equations are linearized for rotating magnetized surroundings.These are then Fourier analyzed and the corresponding dispersion relations are obtained.These relations are discussed both analytically and numerically in order to investigate the nature of waves with positive angular frequency around the horizon.