Which of the following would not be a possible function for f (x) and g(x) such that f of g of x is equal to 6 over the quantity x squared end quantity plus 3 f of x is equal to 6 over the quantity x squared end quantity plus 3 and g(x) = x f of x is equal to 6 over x plus 3 and g(x) = x2 f of x is equal to 6 over x plus 3 and g of x is equal to 1 over the quantity x squared end quantity f of x is equal to 2 over x plus 3 and g of x is equal to x squared over 3