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2014-07-07T22:07:26+08:00

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If the sum of two numbers is a+b

And their difference is a-b    ,

Then the product of their sum and difference is the difference of their squares:
(a+b)(a-b)= a^{2} +ab-ab- b^{2} =\boxed{a^{2} - b^{2} }

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