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For -1 lt x lt 1, if f(x)= cos^(2)(tan^(...

For `-1 lt x lt 1,` if `f(x)= cos^(2)(tan^(-1)sqrt((1-x)/(1+x)))` then f'(x)=

A

`1/2`

B

1

C

`-1`

D

`(-1)/(2)`

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The correct Answer is:
A
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