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What is the value of x, if (b+ sqrt(b^...

What is the value of x, if
`(b+ sqrt(b^(2) - 2bx))/(b-sqrt(b^(2) - 2bx))=a?`

A

`(ab)/(a+b)`

B

`(2ab)/(a+1)`

C

`(2ab)/(a+1)^(2)`

D

`(ab)/(a+b)^(2)`

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