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IF x gt 0 |y| ge 1 and a=(2xy)/(y^2+1) t...

IF `x gt 0 |y| ge 1 and a=(2xy)/(y^2+1)` then the value of `(sqrt(x+a)-sqrt(x-a))/(sqrt(x+a)-sqrt(x-a))` is

A

`1/y`

B

`1/x`

C

`1/(xy)`

D

1

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