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Homework Help: Finding the limit

  1. Jan 8, 2009 #1
    1. The problem statement, all variables and given/known data

    Determine whether the following sequence has a limit. Find the limit if it exists.

    2. Relevant equations


    3. The attempt at a solution

    Im not sure how to go about finding the limit...do i use l'hopitals rule?
  2. jcsd
  3. Jan 8, 2009 #2
    Re: Limits

    When talking about limits you usually specify limit as n approaches something, do you mean infinity?
  4. Jan 8, 2009 #3
    Re: Limits

    It doesnt actually say in the question, so i am assuming it means as n tends to infinity.
  5. Jan 8, 2009 #4


    User Avatar
    Science Advisor

    Re: Limits

    It should be obvious that n/2^n goes to 0 as n goes to infinity. Then use the fact that cos(x) is a continuous function.
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