The following stress element represents the stress state at point A of the structure in the figure below. Detemine the principal stresses in this condition. 52.8 MPa 26.4 MPa О а. 10.94 MPa, -63.74 MPa оь. 8.94 МРа, -60.74 MPa O. - 12.49 MPa, 36.47 MPa O d. -15.49 MРа, 32.47 MPа

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