49n^2-(3n+1)^2=49n^2-(9n^2+6n+1)=49n^2-9n^2-6n-1=40n^2-6n-1
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49n^2-(3n+1)^2=49n^2-(9n^2+6n+1)=49n^2-9n^2-6n-1=40n^2-6n-1