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Mathematics
Mathematics
Problem
sin
−
1
(
4
x
x
2
+
4
)
+
2
tan
−
1
(
−
x
2
)
\sin^{-1}\left(\frac{4x}{x^2+4}\right) + 2 \tan^{-1}\left(-\frac{x}{2}\right)
sin
−
1
(
x
2
+
4
4
x
)
+
2
tan
−
1
(
−
2
x
)
is independent of
x
x
x
, then a.
x
∈
[
−
3
,
4
]
x \in [-3, 4]
x
∈
[
−
3
,
4
]
b.
x
∈
[
−
2
,
2
]
x \in [-2, 2]
x
∈
[
−
2
,
2
]
c.
x
∈
[
−
1
,
1
]
x \in [-1, 1]
x
∈
[
−
1
,
1
]
d.
x
∈
[
1
,
∞
)
x \in [1, \infty)
x
∈
[
1
,
∞
)
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