2. Find the following limits if exist. (a) lim (x,y) -(0,0) 2x2 + 32 (b) Hint: Approach from the diagonal y = x, and you may use L'Hopital's rule. ry lim (x,y)-(0,0) as + y4 (c) (x - 1) (y + 1) lim (r,y)- (1,-1) (x - 1)2(y +1)2