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Question

The HCF of x4−y4andx6−y6 is

A
x2y2
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B
x2+y2
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C
x3+y3
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D
x3y3
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Solution

The correct option is A x2y2
x4y4=(x2y2)(x2+y2)
=(xy)(x+y)(x2+y2)

x6y6=(x3)2(y3)2=(x3y3)(x3+y3)
=(xy)(x2+xy+y2)(x+y)(x2xy+y2)

Reqd HCF = (xy)(x+y)=x2y2

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