In the lecture, about isotropic materials, we introduced that the shear modulus (G) is a function of Young's modulus (E) and Poisson's ratio (v): = 2(1 ) . Prove that this relationship equation is true, by comparing the stresses and strains of the 2D plate below under the prescribed loading condition, against those of the same 2D plate under the same loading condition but viewed in the coordinate rotate by 45o