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f(x) = 1 / (x +2)
x + 2 no puede ser = 0
x +2 = 0
x = - 2
Dominio = R - [ - 2]
Recorrido.
Despejamos x
y = 1 (x +2)
y( x +2) = 1
x +2 = 1/y
x = 1/y + 2
y debe ser diferente de 0
Recorrido = R - [ 0 ]