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प्रश्न
Expand : (a – 2b)2
बेरीज
उत्तर
(a – 2b)2 = (a)2 + (2b)2 − 2 × a × 2b ...[(a−b)2 = a2 + b2 − 2ab]
= a2 + 4b2 − 4ab
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