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प्रश्न
Expand : ( x - 2y + 2 )2
उत्तर
( x - 2y + 2 )2 = x2 + (2y)2 + (2)2 - 2(x)(2y) - 2(2y)(2) + 2(2)(x)
= x2 + 4y2 + 4 - 4xy - 8y + 4x
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