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ggrree Group Title

I have a question dealing with limits. (conceptual) (see next post)

  • 2 years ago
  • 2 years ago

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  1. ggrree Group Title
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    say you had: \[\lim_{x \rightarrow 0} {\tan^8x \over x^8}\] would it be correct to say this?\[\lim_{x \rightarrow 0} ({\tan^x \over x})^8\] and then \[(\lim_{x \rightarrow 0} {\tan^x \over x}) ^8 = (1)^8\]

    • 2 years ago
  2. ggrree Group Title
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    I did the last step with lhospoitals' rule, by the way. done in one step.

    • 2 years ago
  3. ggrree Group Title
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    I'm wondering if it's ok to "bring the limit" inside the brackets, ignoring the ^8 exponential

    • 2 years ago
  4. agreene Group Title
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    your first step is a bit odd, and im not sure you can do exactly that...

    • 2 years ago
  5. agreene Group Title
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    after looking at this again--i thought they were different exponents... \[\large \frac{\tan^8 x}{x^8}=(\frac{\tan x}{x})^8\] is true.

    • 2 years ago
  6. ggrree Group Title
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    yeah, I know the algebraic manipulations are OK, but is it ok to disregard the ^8 and bring the limit inside the brackets?

    • 2 years ago
  7. bmp Group Title
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    Seems okay to me. The resulting limit is the correct one, at least. This is interesting, though. Never thought about it :-) Kudos, mate.

    • 2 years ago
  8. bmp Group Title
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    I wonder if that's the same as taking repetitive L'Hopital rules? I mean, since tanx/x will be 1 as x approaches 0

    • 2 years ago
  9. gordonj005 Group Title
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    i seem to remember this from calc: it's ok to bring the limit inside a function if the function is one-to-one on the interval in question, this is to preserve inequalities in the epsilon-delta definition of the limit

    • 2 years ago
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