How to Evaluate Limits with ln(pi) and ln(4)?

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Discussion Overview

The discussion revolves around evaluating a limit involving the natural logarithm of pi and the natural logarithm of 4. Participants explore various methods to address the limit, including the application of L'Hôpital's rule and rewriting expressions with a common base.

Discussion Character

  • Exploratory, Technical explanation, Mathematical reasoning

Main Points Raised

  • One participant expresses difficulty in applying L'Hôpital's rule to resolve an indeterminate form of infinity over infinity.
  • Another suggests rewriting the fraction using a common base, specifically Euler's number e, to facilitate evaluation.
  • A subsequent participant attempts to illustrate the rewriting process but seeks clarification on the correct approach.
  • Another contribution explains that pi can be expressed as e raised to a power related to ln(pi), and similarly for 4, leading to a transformation of the limit expression.

Areas of Agreement / Disagreement

Participants do not reach a consensus on the best method to evaluate the limit, and multiple approaches are proposed without resolution of the initial problem.

Contextual Notes

Some assumptions about the properties of logarithms and exponential functions are implied but not explicitly stated. The discussion does not resolve the mathematical steps necessary for a complete evaluation of the limit.

fishingspree2
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Hello,

How would someone evaluate this limit?? :confused:
http://img407.imageshack.us/img407/9899/14403274.gif

I can't get rid of the infinite/infinite problem using l'hospital rule :confused:

thank you
 
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Rewrite the fraction using the same base for each power so that you can express it as Af(x). Ie., Euler's number e makes a useful base.
 
you mean like that? http://img242.imageshack.us/img242/8780/58121121.gif
or like that ? http://img172.imageshack.us/img172/9394/47770366.gif
sorry I don't really know how :confused:
 
Last edited by a moderator:
Pi is ea for some number a while 4 is eb for some number b. In particular, those numbers are ln(pi) and ln(4). We then have eax - bx = e(a-b)x.
 

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