I'm trying to figure out how to prove this inequality

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    Figure Inequality
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Discussion Overview

The discussion revolves around proving an inequality involving the tangent function and its relationship to algebraic expressions. The focus is on finding an algebraic proof rather than relying on graphical methods, with implications for limits and behavior as x approaches infinity.

Discussion Character

  • Mathematical reasoning

Main Points Raised

  • One participant expresses confidence in the inequality's truth based on graphical evidence but seeks an algebraic proof.
  • Another participant requests clarification on the range of x, suggesting a substitution of y=1/x to simplify the problem.
  • A third participant proposes that the inequality is valid for 'large enough x', indicating a threshold value N beyond which the inequality holds.
  • A later reply suggests differentiating the differences between the expressions involved as a potential approach to the proof.

Areas of Agreement / Disagreement

Participants do not reach a consensus on the specifics of the proof or the conditions under which the inequality holds, indicating multiple competing views and approaches to the problem.

Contextual Notes

There is an assumption regarding the behavior of the functions involved as x approaches infinity, but the exact conditions and limits are not fully defined or resolved.

minifhncc
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I'm trying to figure out how to prove this inequality:

I know it's true (by graphing), but what's an algebraic way to prove it?

[tex]1+\frac{1}{3x^2}< x \tan \frac{1}{x} < \frac{1}{\sqrt{1-\frac{2}{3x^2}}}[/tex]

Thanks
 
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You need to specify the range for x. Let y=1/x, it will be easier to handle.
 


I guess it's for 'large enough x' ie. for x>N for some N.

It's actually Euler's limit that I'm trying to prove...
 


Try to differentiate the differences.
 

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