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Problem
Problem
If
f
(
x
)
=
1
−
x
1
+
x
f(x) = \frac{1-x}{1+x}
f
(
x
)
=
1
+
x
1
−
x
, the
f
[
f
(
cos
2
θ
)
]
=
f[f(\cos 2\theta)] =
f
[
f
(
cos
2
θ
)]
=
a.
tan
2
θ
\tan 2\theta
tan
2
θ
b.
sec
2
θ
\sec 2\theta
sec
2
θ
c.
cos
2
θ
\cos 2\theta
cos
2
θ
d.
cot
2
θ
\cot 2\theta
cot
2
θ
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