(a+b) ^ 2 = a^2 + 2ab + b^2
(a-b) ^ 2 = a^2 - 2ab + b^2
a^2-b^2 = (a+b) * (a-b)
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(a+b) ^ 2 = a^2 + 2ab + b^2
(a-b) ^ 2 = a^2 - 2ab + b^2
a^2-b^2 = (a+b) * (a-b)