The stresses at a point on the frame of a car were determined by the finite element method and are as shown by the following stress matrix: 1812912126966ksi Determine (a) the normal and shear stresses on a plane that has an outward normal at 37,120, and 70.43 to the x,y, and z directions, respectively, (b) the principal stresses, (c) the second principal direction, and (d) the magnitude of the octahedral shear stress