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If y=cos^(2)[tan^(-1)sqrt((1-x)/(1+x)))]...

If `y=cos^(2)[tan^(-1)sqrt((1-x)/(1+x)))]` then `dy/dx=`

A

`(1)/(2)`

B

`-(1)/(2)`

C

`(1)/(x)`

D

`-(1)/(x)`

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