a2-b2=(a + b)(a-b)
a2+b2=(a + b)2-2ab
a2+b2=(a - b)2+2ab
(a + b)2=(a-b)2+4ab
Source: পরিবেশ অধিদপ্তর (কম্পিউটার অপারেটর) 06-03-2020
Answer: a2+b2=(a - b)2+2ab
Explanation:
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