a=2,
[a^2/(a-1) ]-a-1
=( a^2 -a^2+1)/(a-1)
=1/(a-1)
=1/(2-1)
=1
[a^2/(a-1) ]-a-1
=( a^2 -a^2+1)/(a-1)
=1/(a-1)
=1/(2-1)
=1
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