a²-1/a²-2a+1
/=Sobre
(a² - 1)/(a² - 2a + 1) = (a + 1)*(a - 1)/((a - 1)² = (a + 1)/(a - 1)
pronto
a²-1/a²-2a+1=
(a+1)(a-1)/(a-1)(a-1)=
a+1/a-1
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Verified answer
(a² - 1)/(a² - 2a + 1) = (a + 1)*(a - 1)/((a - 1)² = (a + 1)/(a - 1)
pronto
a²-1/a²-2a+1=
(a+1)(a-1)/(a-1)(a-1)=
a+1/a-1