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(a + b) ^2 - (a - b) ^2
(a^2 + 2ab + b^2 ) - ( a^2 - 2ab + b^2)
a^2 + 2ab + b^2 - a^2 + 2ab - b^2
4ab.
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Answer:
(a+b)^2-(a-b)^2
= a^2+2ab+b^2-(a^2-2ab+b^2)
= a^2+2ab+b^2-a^2+2ab-b^2
= 4ab
hope it helps you
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