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Complex limit.

  1. Mar 13, 2013 #1
    ImageUploadedByPhysics Forums1363212190.536477.jpg

    See attached image.
    Can't seem to get alpha to compute this. Had this in a test and it stumped me. Could someone explain how to find the limit? Thanks in advance guys.
  2. jcsd
  3. Mar 13, 2013 #2
    Just divide top and bottom by [itex]n[/itex]. Then the limit of the numerator is 1, while the limit of the denominator is [itex]2i[/itex] (the [itex]\frac{(-1)^n}{n}[/itex] has magnitude which tends to [itex]0[/itex]).
  4. Mar 13, 2013 #3
    Cool, thanks man. I was under impression that I had to separate the function up into it's real and imaginary parts.
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