a² - b² – (a + b)^2
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(a+b)^2 = a^2 + 2ab + b^2
Therefore,
a^2 - b^2 - (a^2 + 2ab + b^2)
= a^2 - b^2 - a^2 -2ab - b^2
= -2b^2 - 2ab
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