a^2-b^2-a-b
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(a-b)(a+b)-a-b [a^2-b^2=(a+b)(a-b)]
=(a-b)(a+b)-(a+b) [ Taking '-' sign as question]
=(a+b){(a-b)-1} [Taking (a+b) as common]
=(a-b)(a+b)-(a+b) [ Taking '-' sign as question]
=(a+b){(a-b)-1} [Taking (a+b) as common]
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