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If `x` is a solution of the equation `sqrt(2x+1)-sqrt(2x-1)=1 (x >=1/2)` then `sqrt(4x^2-1)=` (i) `3/4` (ii)`1/2` (iii)`2` (iv)`2sqrt2`

A

`(3)/(4)`

B

`(1)/(2)`

C

`2 sqrt(2)`

D

2

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A
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