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duckiness Group Title

Does the series cos n /(n^3) converge or diverge?

  • one year ago
  • one year ago

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  1. modphysnoob Group Title
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    n^3 would converge

    • one year ago
  2. duckiness Group Title
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    what test would you use to prove it?

    • one year ago
  3. modphysnoob Group Title
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    p test

    • one year ago
  4. modphysnoob Group Title
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    I am assuming it is from 1 to infinity

    • one year ago
  5. xkylex Group Title
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    Yes, it would be converge

    • one year ago
  6. duckiness Group Title
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    yep! I just don't know how to prove it with a test

    • one year ago
  7. xkylex Group Title
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    http://mathforum.org/library/drmath/view/74703.html

    • one year ago
  8. modphysnoob Group Title
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    start with just 1/n^3

    • one year ago
  9. duckiness Group Title
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    could you use the comparison test?

    • one year ago
  10. modphysnoob Group Title
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    yes, 1/n^3 always converge

    • one year ago
  11. modphysnoob Group Title
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    cos (x)<1

    • one year ago
  12. xkylex Group Title
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    It does not require a paragraph of an explanation, you could either use the link I showed you for an example as they do some hardcore calculating or you can follow what modphysnoob is doing.

    • one year ago
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