Using n>=N ==> | A_n - L | < e
Most the proofs I read say to start with | a_n - 1 | < e and work backwards to find N but I have done so and I cannot eliminate then n term. I am stuck and any tips / help would be hugely appreciated.
I end up getting
1+2n - (-1)^n
-------------- < e
n^2 +2n+1