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7
Evaluate $\lim_{x \to 0} \left(\frac{1}{\ln(1+x)} + \frac{1}{\ln(1-x)}\right)$
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6
Is there a forumla for number of primes preceding a natural number?
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5
Sanity check, is $\{(-9,-3),(2,-1),(7,7),(-1,-1)\}$ a function?
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