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Okay, this is a good start. Defining limits tending toward infinity and differentiating between positive and negative infinity is crucial. I like how they're immediately framing it around polynomial and rational functions – that's the core distinction.

Ah, so the key differentiator is whether 'x' appears in the denominator. That's a clear way to separate polynomials from rational functions. Makes sense why they'd tackle them separately then, based on that structural difference.

Focusing on the highest exponent term for polynomials – that's a neat simplification. So, all the other smaller terms just fade into insignificance as x gets huge? I can see how that would make the math much more manageable.

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For polynomial functions tending towards infinity, the key is to focus solely on the term with the highest exponent [0:40]. This is because, as the input approaches infinity, the term with the largest power will dominate the function's behavior [1:01]. To determine the limit's sign, substitute infinity into this dominant term and analyze the resulting sign [1:42]. Importantly, for polynomial limits at infinity, the answer will always be either positive or negative infinity, as multiplying an infinitely large number by a constant still results in an infinitely large number [2:23].

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