We present the investigation results of the in-plane rho(T) resistivity tensor at the temperature range 0,4 - 40 K in magnetic fields up to 90 kOe (H || c, J || ab) for electron-doped Nd_2-xCe_xCuO_4+delta with different degree of disorder near antiferromagnetic-superconducting phase boundary. We have experimentally found that for optimally doped compound both the upper critical field slope and the critical temperature decrease with increasing of the disorder parameter (d-wave pairing) while in the case of the underdoped system the critical temperature remains constant and dH_c2/dT increases with increasing of the disorder (s-wave pairing). These features suggest a possible implementation of the complex mixture state as the s+id pairing.

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