Efetuando \boxed{( \frac{1}{ \sqrt{3}-1} + \frac{1}{ \sqrt{3}+1 })^{-2}} , obtemos:

A) 4.

B)  \frac{1}{4}.

C) 3.

D)  \frac{1}{3}.

E) 2 \sqrt{3}

Divirtam-se. :))
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