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If x=7+4sqrt(3)\ \ a n d\ x y=1 , then 1...

If `x=7+4sqrt(3)\ \ a n d\ x y=1` , then `1/(x^2)+1/(y^2)=` 64 (b) 134 (c) 194 (d) `1/(49)`

A

194

B

57

C

`85sqrt3`

D

`(5+4sqrt3)/(7-4sqrt3)`

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A
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