(a-b)(a-b)-(a+b) is equal
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(a-b)(a-b)-(a+b)
= (a-b)^2 - (a+b)
=a^2 +b^2 - 2ab- a- b
= (a-b)^2 - (a+b)
=a^2 +b^2 - 2ab- a- b
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