Derivative Existence at Vertical Asymptotes: A Mystery or a Certainty?

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Discussion Overview

The discussion centers around the existence of a derivative at vertical asymptotes, specifically examining the function 1/(x^2) at x=0. Participants explore the implications of a function being undefined at certain points and how that affects derivative existence.

Discussion Character

  • Conceptual clarification, Technical explanation

Main Points Raised

  • One participant questions whether the derivative at a vertical asymptote can be infinite or simply non-existent.
  • Another participant asserts that for a function to have a derivative at a point, it must be defined at that point, indicating that since 1/(x^2) is not defined at x=0, the derivative does not exist.
  • A later reply reinforces the idea that if the function is not defined at a point, then the derivative cannot exist there.

Areas of Agreement / Disagreement

Participants generally agree that if a function is not defined at a point, then the derivative does not exist at that point. However, there is some uncertainty regarding the nature of the derivative at vertical asymptotes.

Contextual Notes

The discussion does not address the broader implications of derivatives at vertical asymptotes or any potential exceptions, focusing solely on the specific case of the function 1/(x^2).

you878
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Does a derivative exist at a vertical asymptote of a function?

For the function 1/(x^2), there is a vertical asymptote at x=0. I know that the limit of the function at x=0 is Infinity, but is the derivative at x=0 also infinity, or does it just not exist?
 
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Hello you878! :smile:

For a function to have a derivative at a point, the function must be defined in that point. The function 1/x2, is not defined in 0, hence there is no derivative.
 
Thanks for the clarification. I had a feeling it wouldn't exist, but was a little unsure.
 
The derivative of f(x) at x0 is
lim_(h-> 0) (f(x0+ h)- f(x0))/h

if f(x0) does not exist then then the derivative there does not exist.
 

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