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प्रश्न
Expand : ( x + y - z )2
उत्तर
( x + y - z )2 = x2 + y2 + z2 + 2(x)(y) - 2(y)(z) - 2(z)(x)
= x2 + y2 + z2 + 2xy - 2yz - 2zx
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