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If x= 8 +3 sqrt 7 and xy =1 then the ...

If ` x= 8 +3 sqrt 7 and xy =1 ` then the value of `(1)/(x^(2)) + (1)/(y^(2))` is :

A

`254 `

B

` 192`

C

` 292`

D

`66`

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The correct Answer is:
A
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