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Byju's Answer
Standard XII
Mathematics
Modulus of a Complex Number
The principal...
Question
The principal value of
sin
−
1
{
tan
(
−
5
π
4
)
}
is
A
π
4
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B
−
π
4
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C
π
2
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D
−
π
2
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Solution
The correct option is
D
−
π
2
Principal value of
s
i
n
−
1
tan
(
−
5
π
4
)
=
sin
−
1
(
−
tan
(
π
+
π
4
)
)
=
sin
−
1
(
−
1
)
=
−
π
2
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0
Similar questions
Q.
The value of
sin
−
1
1
2
+
cos
−
1
1
2
+
tan
−
1
1
√
3
is
(
a
)
2
π
3
(
b
)
π
2
(
c
)
3
π
4
(
d
)
5
π
6
Q.
Inverse circular functions,Principal values of
s
i
n
−
1
x
,
c
o
s
−
1
x
,
t
a
n
−
1
x
.
t
a
n
−
1
x
+
t
a
n
−
1
y
=
t
a
n
−
1
x
+
y
1
−
x
y
,
x
y
<
1
π
+
t
a
n
−
1
x
+
y
1
−
x
y
,
x
y
>
1
.
Prove that
t
a
n
−
1
(
1
2
t
a
n
2
A
)
+
t
a
n
−
1
(
c
o
t
A
)
+
t
a
n
−
1
(
c
o
t
3
A
)
0
if
π
/
4
<
A
<
π
/
2
and
=
π
if
0
<
A
<
π
/
4
.
Q.
Inverse circular functions,Principal values of
s
i
n
−
1
x
,
c
o
s
−
1
x
,
t
a
n
−
1
x
.
t
a
n
−
1
x
+
t
a
n
−
1
y
=
t
a
n
−
1
x
+
y
1
−
x
y
,
x
y
<
1
π
+
t
a
n
−
1
x
+
y
1
−
x
y
,
x
y
>
1
.
(a)
t
a
n
−
1
1
2
+
t
a
n
−
1
1
3
=
π
4
.
(b)
t
a
n
−
1
1
2
+
t
a
n
−
1
1
5
+
t
a
n
−
1
1
8
=
π
4
(c)
t
a
n
−
1
3
4
+
t
a
n
−
1
3
5
−
t
a
n
−
1
8
19
=
π
4
Q.
Inverse circular functions,Principal values of
s
i
n
−
1
x
,
c
o
s
−
1
x
,
t
a
n
−
1
x
.
t
a
n
−
1
x
+
t
a
n
−
1
y
=
t
a
n
−
1
x
+
y
1
−
x
y
,
x
y
<
1
π
+
t
a
n
−
1
x
+
y
1
−
x
y
,
x
y
>
1
.
(a)
s
i
n
−
1
(
3
x
/
5
)
+
s
i
n
−
1
(
4
x
/
5
)
=
s
i
n
−
1
x
(b)
c
o
s
−
1
x
+
s
i
n
−
1
(
1
2
x
)
=
π
6
(c) If
a
≤
t
a
n
−
1
(
1
−
x
1
+
x
)
≤
b
where
0
≤
x
≤
1
then
(
a
,
b
)
=
(a)
(
0
,
π
)
(b)
(
0
,
π
/
4
)
(c)
(
−
π
/
4
,
π
/
4
)
(d)
(
π
/
4
,
π
/
2
)
(d) If
a
≤
(
s
i
n
−
1
x
)
3
+
(
c
o
s
−
1
x
)
3
≤
b
then (a,b) is equal to
(
π
3
32
,
7
π
3
8
)
.
Q.
Let
f
(
x
)
=
sin
4
x
+
cos
4
x
. Then
f
is an increasing function in the interval :
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