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If f(x) = (1-x)/(1+x), then f[f(cos x)]=...

If `f(x) = (1-x)/(1+x)`, then `f[f(cos x)]`=

A

`(1-cosx)/(1+cosx)`

B

x

C

`cos x`

D

`tan^2(x/2)`

Text Solution

Verified by Experts

The correct Answer is:
C
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