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प्रश्न
Evaluate: (6 − 5xy) (6 + 5xy)
बेरीज
उत्तर
(6 − 5xy) (6 + 5xy)
= (6)2 − (5xy)2
= 36 − 25x2y2 .........[ ∵ (a − b) (a + b) = a2b2]
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