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  • DLS

limits

Mathematics
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  • DLS
\[\LARGE \lim_{x \rightarrow 0} \frac{1+e^{\frac{-1}{x}}}{1-e^{\frac{-1}{x}}} \]
  • DLS
1) 1 2)-1 3)0 4)Does not exist
can u use L'Hopitals ?

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Other answers:

  • DLS
anything
then try, x= -1/y to get y->-infinity and then L'Hopitals.
  • DLS
|dw:1358405846397:dw| how will we solve this LHL anyway?
where did 'a' come from ? did you try x=-1/y ?
  • DLS
its 0 not a nevermind sry :o and i dont want to use L hospital because i know answer is 4 :P
why do i get -1 ? :P
  • DLS
LHL=-1 RHL=1 Limit does not exist :o
confirmed with wolf ?
  • DLS
no with answer key..:o but how did we solve LHL to -1
hmm....you can put h=-h in LHL to get same form as of RHL, that is of h->0+
  • DLS
|dw:1358406440539:dw| but this :/??
you found RHL ? or not ? because above thing is just substituting x +h=a for that i suggested, x=-1/y instead.(and you get -1 then)
  • DLS
why x=-1/y? can u show clearly :/
x=-1/y ---->-1/x = y to make the exponent of e as 'y' so that using L'Hopitals is easy (1+e^y)/(1-e^y) -----> e^y/(-e^y) ---->-1
  • DLS
itni si baat batane me aadha ghanta lagadia be :p
:P but the limit doesn't exist, right ? you got that using LHL and RHL ?
  • DLS
yes..
good :)

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