The value of (a+b)² _ (a-b)²
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We know that,
(a+b)² = a²+2ab+b²
and
(a-b)² = a²+b²-2ab
According to question :--
(a²+2ab+b²)-(a²-2ab+b²)
= a²+2ab+b²-a²+2ab-b²
= 4ab
Hence value of (a+b)² - (a-b)² is 4ab
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