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Question

Simplify (i) (x1x)(x+1x)(x2+1x2)(x4+1x4)
(ii) (2x+y)(2xy)(4x2+y2)

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Solution

(i) (x1x)(x+1x)(x2+1x2)(x4+1x4)
=(x21x2)(x2+1x2)(x4+1x4)
=[(x2)2(1x2)2](x4+1x4)
=(x41x4)(x4+1x4)=(x4)2(1x4)2=x81x8
(ii) (2x+y)(2xy)(4x2+y2)
=[(2x)2(y)2](4x2+y2)
=(4x2y2)(4x2+y2)
=(4x2)2(y2)2=16x4y4

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