2≤x≤32 \leq x \leq 32≤x≤3
−2≤x≤3-2 \leq x \leq 3−2≤x≤3
R−[−3,2]\mathbb{R}-[-3,2]R−[−3,2]
R−[−3,−2]\mathbb{R}-[-3,-2]R−[−3,−2]