(a+b)²-(a-b)²=4ab

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(a+b)²-(a-b)²=4ab
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(a+b)²-(a-b)²=4ab
(a+b)²-(a-b)²=4ab

(a+b)²-(a-b)²=4ab
(a+b)²-(a-b)²
=a²+2ab+b²-(a²-2ab+b²)
=a²+2ab+b²-a²+2ab-b²
=4ab