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Question

Expand:(n1n)(n+1n)(n2+1n2)

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Solution

As we know the formula (a+b)(ab)= a2b2
So (n1n)(n+1n) = (n)2(1n)2
= (n)2(1n2)
= (n21n2)(n21n2)
= (n21n2)(n21n2) = (n2)2(1n2)2
= n41n4

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