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Question

নিচের কোনটি অভেদ?
(x-3)2 + (x + 3)2 = 2(x2+9)
(x+2)2 + (x-2)2 = = x2 + 4
x3-y3 = (x + y) (x2 + xy + y2)
(x + y)2 + (x - y)2 = 4xy
ANS : 1
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