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If agtbgt0,sec^(-1)((a+b)/(a-b))=2"sin"^...

If `agtbgt0,sec^(-1)((a+b)/(a-b))=2"sin"^(-1)x`, then x =

A

`sqrt((b)/(a+b))`

B

`-sqrt((b)/(a+b))`

C

`sqrt((a)/(a+b))`

D

`-sqrt((a)/(a+b))`

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A
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