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/// x^2 - 1 = (x+1)(x-1), wiec
=( ( 1 + (1/(x-2)) ) (x+1) + (x-1)(x+1) ) =
= (1 + (1/(x-2)) +x - 1)(x+1) =
= (x + 1/(x-2) )(x+1)=
= ( ( x(x-2)+1 ) / (x-2) ) (x+1) =
= (x+1)(x^2-2x+1) / (x-2) =
= (x+1)(x-1)^2 / (x-2)
odp. tak, jest prawdziwa