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प्रश्न
Find the following squares by suing the identities
(xy + 3z)2
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उत्तर
(xy + 3z)2 = (xy)2 + 2(xy) (3z) + (3z)2 [(a + b)2 = a2 + 2ab + b2]
= x2y2 + 6xyz + 9z2
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