GATE Civil Engineering (CE) 2022 Shift 2 Solved Paper

Stresses acting on an infinitesimal soil element are shown in the figure (with σ_z > σ_x). The major and minor principal stresses are σ₁ and σ₂, respectively. Considering the compressive stresses as positive, which one of the following expressions correctly represents the angle between the major principal stress plane and the horizontal plane?