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Math Help - calculus convergent series

  1. #1
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    calculus convergent series

    plz help
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  2. #2
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    2nd One]

    n^2/sqrt(n^4+1) >= n^2/sqrt(n^4+3n^4) = n^2/2n^2=1/2

    So how can the term a_n converge to zero, if infinitely many terms are above 1/2?

    Thus, it diverges by the divergence theorem.
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