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For the state of stress defined in Example 3, determine the magnitudes and direction cosines of the principal stresses. (Answers: 147.4 /m²,=+0.7382,m=+0.1266,=+0.6625;76.6 /m²,=-0.6456,m=+0.4172,=+0.6397;-86.1 / m²,= +0.1954,m=+0.9000,=-0.3897.) from the principal stress. ₁=-86.05/m² ₂=147.4,m/m² ₃=76.61,/m²
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