1. The problem statement, all variables and given/known data 1/b - 1/3 ----------- b-3 Lim b ----> 3 2. Relevant equations 3. The attempt at a solution This is driving me nuts. I always end with 0 but thats not the answer. I tried direct substitution and it didn't work. I tried plugging in 2.999999999 but it gives a very small number devided by a very small number I tried the conjugate and even deviding by the highest power altho thats for infinity.