π/3 + 2πn ≤ x ≤ 2π/3 + 2πn (где n є Z) х є [π/3 + 2πn; 2π/3 + 2πn] (где n є Z)
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π/3 + 2πn ≤ x ≤ 2π/3 + 2πn (где n є Z) х є [π/3 + 2πn; 2π/3 + 2πn] (где n є Z)