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If `x = a +1/a` and `y=a-1/a` then `sqrt(x^4+ y^4-2x^2y^2)` is equal to :
यदि `x = a +1/a` और `y=a-1/a` है, तो `sqrt(x^4+ y^4-2x^2y^2)` का मान किसके बराबर होगा?

A

`16 a^2`

B

8

C

`8/a^2`

D

4

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