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I really don’t like problems that talk about $$ \lim_{x \to \infty}{\sqrt {x^2+x} - x} $$. I much prefer \lim_{x \to \infty}{\sqrt {x^2+ x + 10^6} - x}
– Eric Hsu 2008-07-11 12:53
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– Eric Hsu 2008-07-11 13:32