If A =(x-1)/(x+1)then, the value of A-1...

If `A =(x-1)/(x+1)`then, the value of `A-1/A` is:

A

`(-4(2x-1))/(x^(2)-1)`

B

`(x^(2)-1)/(-4(2x-1))`

C

`(x^(2)-1)/(-4(2x+1))`

D

`(-4x)/(x^(2)-1)`

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The correct Answer is:

D

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