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Question
Mathematics
Find the principal value cot-1 (1)
Q. Find the principal value
co
t
−
1
(
1
)
5705
235
Inverse Trigonometric Functions
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A
3
π
9%
B
4
π
73%
C
2
π
10%
D
0
8%
Solution:
Let
co
t
−
1
(
1
)
=
θ
⇒
co
t
θ
=
1
=
co
t
4
π
⇒
θ
=
4
π
∈
(
0
,
π
)
∴
Principal value of
co
t
−
1
(
1
)
is
4
π