MPa and the z-direction shear stresses

Suppose that
σxx = 17.24 σyy = 35.86 τxy = 25.52 in MPa and the z-direction shear stresses (τzx, τzy) are zero, while the z-direction normal stress (σzz) is 27.59 MPa. Find: the major, intermediate, and minor principal stresses.
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