⇒ x ∈ [-3; 3]
⇒ x ∈ (-∞; 1) ∪ (1; ∞)
⇒ D(f) = [-3; 1) ∪ (1; 3]
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⇒ x ∈ [-3; 3]
⇒ x ∈ (-∞; 1) ∪ (1; ∞)
⇒ D(f) = [-3; 1) ∪ (1; 3]