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Question: dont know how to do 1eand 2aplease show all the...

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don't know how to do 1(e)and 2(a),please show all the steps,thanks
1. Determine the convergence/divergence of the following series. (b) Σ, cos(1/n); (c) Σ001 cos(1/n3); 3 2- cos(a/n) n(n+1) n=1 (h) Σ001 1+cos(n) ; 2. Use Cauchy-Condensation test or Integral test to determine the convergence a»Σno 1 nın ; an=nTan ve an20.vn리
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