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a^2 + b^2 + 2ab = (a + b)^2
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a square plus 2ab plus b square
(a - b)2 = a2 - 2ab + b2 square ft
b/2=2ab/+b means112.5
a2+b2+c2-2ab+2bc-2ca
5ab-2ab+4a-b+5b = 3ab+4a+4b