(n+1)^2=n^2+2n+1
->(n+1)^2-n(2n+1)=-n^2-n=n^2-n(2n+1)
->(n+1)^2-n(2n+1)+(2n+1)^2/4=n^2-n(2n+1)+(2n+1)^2/4
->((n+1)-(2n+1)/2)^2=(n-(2n+1)/2)^2
->n+1-(2n+1)/2=n-(2n+1)/2
->n+1=n
???
(n+1)^2=n^2+2n+1
->(n+1)^2-n(2n+1)=-n^2-n=n^2-n(2n+1)
->(n+1)^2-n(2n+1)+(2n+1)^2/4=n^2-n(2n+1)+(2n+1)^2/4
->((n+1)-(2n+1)/2)^2=(n-(2n+1)/2)^2
->n+1-(2n+1)/2=n-(2n+1)/2
->n+1=n
???
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