n = 1 cos (n / 3) n! Step 1 of 2 Since - 1 cosx...

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n = 1 cos (n / 3) n! Step 1 of 2 Since - 1 cosx 1, | cosx| 1. Let bn = 1 n! |- Since | an b, then if b converges, an will by the Comparison Test. Use b for the Ratio Test. 1 n | bn +1 bn (n + 1)! = n! n! = (n + 1)! n! n!(n + 1) = 1 n+1 n = 1 cos (n / 3) n! Step 1 of 2 Since - 1 cosx 1, | cosx| 1. Let bn = 1 n! |- Since | an b, then if b converges, an will by the Comparison Test. Use b for the Ratio Test. 1 n | bn +1 bn (n + 1)! = n! n! = (n + 1)! n! n!(n + 1) = 1 n+1