Let f andgbe functions that are differentiable for all real numbers, with gfz) # 0for a0.f()fl)0 g)f()If lim f(z) = lim g(z) = 0 and lim0exists, then lim is ()0 g()+0(r)Bd(r))g()-fla)d ()(f))A.OC.limz0 g(r)DE.nonexistent