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Question

Use suitable identities to find the product :
(x2+1x2)(x21x2)

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Solution

We need to find value of (x2+1x2)(x21x2)
The suitable identities (x+y)(xy)=x2y2
Therefore, value of (x2+1x2)(x21x2) is
=((x2)21(x2)2)
=x41x4

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