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Mathematics
Problem
cot
−
1
(
1
−
x
2
1
+
x
2
)
\cot^{-1}\left(\sqrt{\frac{1-x^2}{1+x^2}}\right)
cot
−
1
(
1
+
x
2
1
−
x
2
)
is equal to a.
cos
−
1
(
x
2
)
\cos^{-1}(x^2)
cos
−
1
(
x
2
)
b.
π
2
−
1
2
cos
−
1
(
x
2
)
\frac{\pi}{2} - \frac{1}{2}\cos^{-1}(x^2)
2
π
−
2
1
cos
−
1
(
x
2
)
c.
π
3
−
1
2
cos
−
1
(
x
2
)
\frac{\pi}{3} - \frac{1}{2}\cos^{-1}(x^2)
3
π
−
2
1
cos
−
1
(
x
2
)
d. None of these
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