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 --px and py with s make trigonal base of equitorial bonds
Then dz2 and pz 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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