Problem 3 As shown below, the beam -b < y p(x) = S on the upper edge, y = b, the remaining edges, x = 0, y = b being traction-free. In[]:= P(+)-5 FIX a. Using the approach discussed in lecture the correct general form of the stress function (6th degree) is given below. Using the concepts discussed in lecture explain why this is so. = Cx+Cxy+C3y+C4x +C5 x y+C6xy + C7 y + C8 x + C9 x y+C10 x y+C 11 x y +C12 y+C13x+ C14x+y+C15x3y+C16 x y + C7 y+C 18 y +C19 x +C20 y +C21 x y + C22 y + C23 x y+C24 x y + C25 y 6 b. Find the stress components xx, yy, and oxy. When giving your final answers expand all terms and leave no parenthesis. For example, write xy + xy notxy(1+y).