у=2/(у²-9)
у²-9≠0
у²≠9
у₁≠3 у₂≠-3
у∈(-∞;-3)∪(-3;3)∪(3;+∞)
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у=2/(у²-9)
у²-9≠0
у²≠9
у₁≠3 у₂≠-3
у∈(-∞;-3)∪(-3;3)∪(3;+∞)