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Identify the horizontal asymptote of different rational functions by understanding their end behavior as the function approaches infinity and negative infinity.
https://www.khanacademy.org/math/precalculus-tx/xecf67014514b60db:rational-functions-equations-and-inequalities/xecf67014514b60db:rational-function-key-features/v/analyzing-horizontal-asymptotes-of-rational-functions-precalculus-khan-academy

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