Maths Question

Let n be 1.

(n-1)-n=(n-1)-1
((n-1)-n)^2=(n-1)^2-1
(n+1)(n-1)-n^2=(n+1)(n-1)-1
(n+1)(n-1)=(n+1)(n-1)-(1+n^2)
(n+1)=(n+1)-(1+n^2)
(1+1)=(1+1)-(1+1^2)
2=2-(1+1)
2=2-2
2=0?

There are 3 errors in this question. Can you spot them?