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D: x^2+3≠0
x^2+3>0
D: x€R
b)
D: x(x+1)≠0
x≠0 i x+1≠0
x≠-1
D: x€R\{-1,0}
c)
D: x+5≠0 i x-3≠0
x≠-5. x≠3
D: x€R\{-5,3}