If \[f(x)=\frac{1-x}{1+x},\] the n \[f[f(\cos \ 2\theta )]=\] [MP PET 1994, 2001; Pb. CET 2002]

If \[f(x)=\frac{1-x}{1+x},\] the n \[f[f(\cos \ 2\theta )]=\] [MP PE

1.	If \[f(x)=\frac{1-x}{1+x},\] the n \[f[f(\cos \ 2\theta )]=\] [MP PET 1994, 2001; Pb. CET 2002]
A.	\[\tan 2\theta \]
B.	\[\sec 2\theta \]
C.	\[\cos 2\theta \]
D.	\[\cot 2\theta \]
Answer» D. \[\cot 2\theta \]

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