Determing range of x for which series converges or diverges

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SUMMARY

The series Σ (x^n)/(1+x^(2n)) converges or diverges based on the value of x. Utilizing the ratio test is essential for determining convergence, particularly by analyzing the behavior as n approaches infinity. The discussion emphasizes the importance of clarifying the expression with parentheses to avoid ambiguity in the mathematical formulation. Key values of x can be identified through this analysis, leading to a clearer understanding of the series' convergence properties.

PREREQUISITES
  • Understanding of series convergence tests, specifically the ratio test.
  • Familiarity with limits and behavior of functions as n approaches infinity.
  • Basic knowledge of mathematical notation and expressions.
  • Ability to manipulate algebraic expressions involving powers of x.
NEXT STEPS
  • Study the application of the ratio test in detail.
  • Explore convergence criteria for power series.
  • Investigate the behavior of sequences and series as n approaches infinity.
  • Learn about other convergence tests such as the root test and comparison test.
USEFUL FOR

Mathematicians, students studying calculus, and anyone interested in series convergence analysis will benefit from this discussion.

pablito21
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im trying to solve this excersice but i couldn't find any similar questions like this one

find for which real x the series SIGMA x^n/1+x^2n converges and for which it diverges
 
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Your expression involving x is ambiguous. I suggest you put parentheses into clarify the order for division and addition.
 
Assuming it's supposed to be [tex]\sum_{n=1}^{infinity} \frac{x^{n}}{1+x^{2n}}[/tex], you can use the ratio test to compute when it's convergent or not. Just by judging 'large n behaviour' you should be able to narrow down the possible interesting values of x pretty quickly.
 

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