Beer & Johnston — Transformations of Stress and Strain: Problem 7.130

7.128 through 7.131 For the given state of plane strain, use the method of Sec. 7.7A to determine the state of plane strain associated with axes \(x'\) and \(y'\) rotated through the given angle \(\theta\). 7.130: \(\epsilon_x = -500 \mu, \quad \epsilon_y = +250 \mu, \quad \gamma_{xy} = 0, \quad \theta = 15^\circ \uparrow\)