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प्रश्न
Multiply: (xy + 2b)(xy - 2b)
बेरीज
उत्तर
(xy + 2b)(xy - 2b)
⇒ xy (xy - 2b) + 2b (xy - 2b)
⇒ x2y2 - 2bxy + 2bxy - 4b2
⇒ x2y2 - 4b2
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