Here it is
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dz2 orbitals are not in plane of equitorial px and py and it is in the plane of pz so in sp3d hybridization --p_x and p_y with s make trigonal base of equitorial bonds
Then d_z² and p_z mixes  to form two axial dp orbitals as they in the same plane.
d x2-y2, dxy and dyz are not in the plane of pz.
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