Is f Continuous Everywhere? Analyzing the Limit of a Fractional Function

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The function f(x) = lim _{n->\infty}\frac{x^{2n} - 1}{x^{2n} + 1} is analyzed for continuity. It is suggested that f is continuous everywhere, as there are no x values that make the denominator zero. The function evaluates to 1 for x values greater than or equal to 1 and less than or equal to -1, while it equals -1 for values between -1 and 1. The discussion indicates some uncertainty about the initial understanding of the function's behavior. Ultimately, the question of continuity appears to be resolved.
Calcotron
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Well, my first question was answered so I figured I would post the second problem I had problems with. It is:

f(x) = lim _{n->\infty}\frac{x^{2n} - 1}{x^{2n} + 1}

Where is f continuous? My first thought is that it is continuous everywhere since I can't find an x value that would make the bottom part of the fraction 0. Isn't that function 1 at for \infty < x \leq-1 or 1 \leq x < \infty and -1 otherwise?
 
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Lol, let's just pretend this question never happened ok?
 
I take it that means you've solved the question then?
 
Question: A clock's minute hand has length 4 and its hour hand has length 3. What is the distance between the tips at the moment when it is increasing most rapidly?(Putnam Exam Question) Answer: Making assumption that both the hands moves at constant angular velocities, the answer is ## \sqrt{7} .## But don't you think this assumption is somewhat doubtful and wrong?

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