Considere as funções f(x)=  \sqrt{ x^{2} +1} e g(x)=  \sqrt{x(x-1)} } . É correto afirmar que dominio da função fg é:

a) {0.,1}
b) ∅.
c) |R.
d) (-∞,0) ∪ (1,+∞).
e) (0,1).
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