( a-b ) whole square = a square + b square - 2 ab
How this identity is derived geometrically?
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(a-b)^2=(a-b)a-(a-b)b
=a^2-ab-ba+b^2
therefore
(a-b)^2=a^2-2ab+b^2
=a^2-ab-ba+b^2
therefore
(a-b)^2=a^2-2ab+b^2
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