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f(x) = 3/x Df x ≠ 0
b)
f(x) = - 3/(x + 2) Df x + 2 ≠ 0 , x ≠ - 2
c)
f(x) = x² + 5)/(x + 1) Df x + 1 ≠ 0 , x ≠ - 1
d)
f(x) = √(x + 4) Df x + 4 ≥ 0 , x ≥ - 4