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The value of cos[2tan^(-1)(1+x)/(1-x)+si...

The value of `cos[2tan^(-1)(1+x)/(1-x)+sin^(-1)(1-x^(2))/(1+x^(2))]` is

A

`sqrt2`

B

1

C

0

D

`-1`

Text Solution

Verified by Experts

The correct Answer is:
D
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