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Please prove the following (using epsilon/delta proofs) formally and clearly: For Xn given by the following,...

Please prove the following (using epsilon/delta proofs) formally and clearly:

For Xn given by the following, prove the convergence or divergence of the sequence (Xn):

a) Xn = n2/(2n2+1)

b) Xn = (-1)n/(n+1)

c) Xn = sin(n)/(n2+1)

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