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When a body is subjected to a direct tensile stress (σx) in one plane accompanied by a simple shear stress (τxy), the minimum normal stress is

A. x/2) + (1/2) × √(σx² + 4 τ²xy)

B. x/2) - (1/2) × √(σx² + 4 τ²xy)

C. x/2) + (1/2) × √(σx² - 4 τ²xy)

D. (1/2) × √(σx² + 4 τ²xy)

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