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Problem
## EXERCISE 2.2 Write the following functions in the simplest form: 4.
tan
−
1
(
1
−
cos
x
1
+
cos
x
)
,
0
<
x
<
π
\tan ^{-1}\left(\sqrt{\frac{1-\cos x}{1+\cos x}}\right), 0<x<\pi
tan
−
1
(
1
+
c
o
s
x
1
−
c
o
s
x
)
,
0
<
x
<
π
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