প্রশ্নঃ
a2 + b2 = কত?
-
ক.
(a - b)2 -2ab
-
খ.
(a - b)2 - 4ab
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গ.
(a + b)2 + 2ab
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ঘ.
(a + b)2 - 2ab
উত্তরঃ ঘ
 (a - b)2 -2ab খ) (a - b)2 - 4ab গ) (a + b)2 + 2ab ঘ) (a + b)2 - 2ab উত্তর: ঘ) (a + b)2 - 2ab
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