Prove that the sum of the normal stresses is constant. See Figs. 92a and 92b
Chapter 9, Problem 9-1(choose chapter or problem)
Prove that the sum of the normal stresses \(\sigma_x+\sigma_y=\sigma_{x^{\prime}}+\sigma_{y^{\prime}}\) is constant. See Figs. 9-2a and 9-2b.
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