Factorise
C^2+2ab-(a^2+b^2)
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=c^2 + 2ab-a^2-b^2
=c^2-(a-b)^2
=(c-a+b)(c+a-b). by using a^2-b^2=(a-b)(a+b)
=c^2-(a-b)^2
=(c-a+b)(c+a-b). by using a^2-b^2=(a-b)(a+b)
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