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If f(x)=cos h ^(-1)((1-x)/(1+x)) is well...

If `f(x)=cos h ^(-1)((1-x)/(1+x))` is well defined, then `f'(x)=`

A

`(-1)/((1+x)sqrt(-x))`

B

`(1)/((1+x)sqrt(x))`

C

`(-1)/((1+x)sqrt(x))`

D

`(1)/((1+x)sqrt(-x))`

Text Solution

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The correct Answer is:
A
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