Find the supremum and infimum of each of the following sets. (a) A = {1, }. } ...} = {zin€N} 1 1 1 2 4 8 2(n-1) (b) C = {ncosnT :n e N} (c) E =D {¥프 :nEN} (d) D= {(1– (-1)")" : n E N}

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