PYQ Vault
Bank
Guides
Notes
Mocks
Board
Blog
About
Bank
Guides
Notes
Mocks
Board
NDA · Maths · Inverse Trigonometry
NDA Inverse Trigonometry — Formulas 1
Question
1
of 14
1.
What is the principal-value range of
cos
−
1
x
\cos^{-1}x
cos
−
1
x
?
A
cos
−
1
x
∈
[
−
π
2
,
π
2
]
\cos^{-1}x \in [-\tfrac{\pi}{2},\tfrac{\pi}{2}]
cos
−
1
x
∈
[
−
2
π
,
2
π
]
B
cos
−
1
x
∈
[
0
,
π
]
\cos^{-1}x \in [0,\pi]
cos
−
1
x
∈
[
0
,
π
]
C
cos
−
1
x
∈
(
0
,
π
)
\cos^{-1}x \in (0,\pi)
cos
−
1
x
∈
(
0
,
π
)
D
cos
−
1
x
∈
(
−
π
2
,
π
2
)
\cos^{-1}x \in (-\tfrac{\pi}{2},\tfrac{\pi}{2})
cos
−
1
x
∈
(
−
2
π
,
2
π
)
Back
Skip