Consider a thin square plate with sides of a. For a stress function of = (P/a) (xy/2 y^/6), where P is a uniformly distributed load per unit length and the origin of coordinate system (x,y) is located at the lower-left corner of the plate. a) Determine the stress field: Ox, y, Txy as a function of location (x and y). b) Calculate the stress components along the boundaries of the plate.