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Real analysis - differential/sequence

  1. Nov 28, 2011 #1
    1. The problem statement, all variables and given/known data

    I attached a .bmp file

    2. Relevant equations

    3. The attempt at a solution

    I don't get this one at all. Since f is differentiable, the interval [a,b] must be continuous, and I cannot use rational/irrational tricks like in limit problems. does anyone have suggestions?

    Attached Files:

  2. jcsd
  3. Nov 28, 2011 #2
    should I just assume that x=c and xn -> c as n->inf?
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