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y = √(x + 2)
x + 2 ≥ 0
x ≥ - 2
Df = < - 2 , ∞)
Zbw = <0 , ∞)
y = x⁻³ = 1/x³
x ≠ 0
Df = R\{0}
Zbw = (- ∞ , 0) , (0 , ∞)