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Question

Question 2 (x)

Add:

x2y21, y21x2, 1x2y2


Solution

x2y21, y21x2, 1x2y2=x2y21+y21x2+1x2y2
=x2x2x2y2+y2y211+1
=(111)x2+(1+11)y211+1
=x2y21

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