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$a^2+b^2=c^2$
PT.1 (pt.1-pt2. is context, Question is in pt.3)
let: $\qquad a=2n+1 \qquad b=2n^2+2n \qquad c=2n^2+2n+1 $
proving that all integer values of n satisfy
$a^2+b^2=c^2$
$(2n+1)^2+(2n^2+2n)^2=(2n^2+2n+1)^2$
$(4n^2+4n+1)+(4n^4+8n^3+4n^2)=(4n^2+8n^3+8n^2+4n+1)$
$4n^4+8n^3+8n^2+4n+1=4n^4+8...