Let fi(n), f2 (n), 91 (n), and g2(n) be functions of n = Z+ such that fi(n) 91 (n) = (92(n)). (a) (5 points) Show that the following may not hold: fi (n) g (n) = (f2(n) 92 (n)). (Here, you need to explicitly construct a counterexample.) (b) (5 points) Show that the following must hold: fi(n)/91 (n) = (f2(n)/92(n)). = (f2(n)) and