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प्रश्न
Simplify by using formula :
(x + y - 3) (x + y + 3)
उत्तर
(x + y - 3) (x + y + 3)
= (x + y)2 - (3)2
= x2 + y2 + 2xy - 9
(Using identity : (a + b)(a - b) = a2 - b2).
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