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Unknown limit theorem

  1. Feb 21, 2012 #1
    Has anybody heard of this theorem before? because it's in my school book and it works with most limit problems but I can't find its name or even find it in any reference book
    Any help or guidance would be appreciated, thanks
  2. jcsd
  3. Feb 21, 2012 #2


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    (x - a) is a factor of both the numerator and the denominator. Try canceling it and see what results.
  4. Feb 21, 2012 #3


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    Or l'Hopital's theorem proves it easily. It's easy enough to prove that I don't think it rates it's own name or a place in reference books.
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