The bar has a cross-sectional area A and is subjected to the axial load P. Determine the average normal stresses acting over the shaded section, which is oriented at $\theta$ from the horizontal. <image 1>
['P/(A)*sin(2$\\theta$)', '(P/A)sin^2($\\theta$)', 'P/(2A)*sin(2$\\theta$)', '(P/2A)sin^2($\\theta$)']