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

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এখানে,
    a^2-2ab+b^2
= (a-b)^2
= (a-b) (a-b)


বিকল্প,
    a^2-2ab+b^2
= a^2-ab-ab+b^2
= a(a-b)-b(a-b)
= (a-b) (a-b)
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