1
You visited us
1
times! Enjoying our articles?
Unlock Full Access!
Byju's Answer
Standard XII
Mathematics
Distance Formula
Let A=[ ...
Question
Let
A
=
⎡
⎢
⎣
x
y
z
y
z
x
z
x
y
⎤
⎥
⎦
, where
x
,
y
and
z
are real numbers such that
x
+
y
+
z
>
0
a
x
y
z
=
2
.
If
A
2
=
I
3
, then the value of
x
3
+
y
3
+
z
3
is
Open in App
Solution
A
=
⎡
⎢
⎣
x
y
z
y
z
x
z
x
y
⎤
⎥
⎦
∴
|
A
|
=
(
x
3
+
y
3
+
z
3
−
3
x
y
z
)
A
2
=
I
3
|
A
2
|
=
1
∴
(
x
3
+
y
3
+
z
3
−
3
x
y
z
)
2
=
1
⇒
x
3
+
y
3
+
z
3
−
3
x
y
z
=
1
as
(
x
+
y
+
z
>
0
)
⇒
x
3
+
y
3
+
z
3
=
6
+
1
=
7
Suggest Corrections
0
Similar questions
Q.
Let
A
=
⎡
⎢
⎣
x
y
z
y
z
x
z
x
y
⎤
⎥
⎦
, where
x
,
y
and
z
are real numbers such that
x
+
y
+
z
>
0
a
x
y
z
=
2
.
If
A
2
=
I
3
, then the value of
x
3
+
y
3
+
z
3
is
Q.
Let
x
,
y
,
z
be non-zero real numbers such that
x
y
+
y
z
+
z
x
=
7
and
y
x
+
z
y
+
x
z
=
9
, then
x
3
y
3
+
y
3
z
3
+
z
3
x
3
−
3
is equal to
Q.
Let
x
,
y
,
z
be positive real numbers such that
x
+
y
+
z
=
12
and
x
3
y
4
z
5
=
(
0.1
)
(
600
)
3
. Then
x
3
+
y
3
+
z
3
is equal to:
Q.
If
x
,
y
,
z
are three real numbers and
A
=
⎡
⎢
⎣
1
cos
(
x
−
y
)
cos
(
x
−
z
)
cos
(
y
−
x
)
1
cos
(
y
−
z
)
cos
(
z
−
x
)
cos
(
z
−
y
)
1
⎤
⎥
⎦
then
A
is
Q.
The number of ways of choosing triplet
(
x
,
y
,
z
)
such that
z
>
m
a
x
{
x
,
y
}
a
n
d
x
,
y
,
z
∈
{
1
,
2
,
…
,
n
,
n
+
1
}
is
View More
Join BYJU'S Learning Program
Grade/Exam
1st Grade
2nd Grade
3rd Grade
4th Grade
5th Grade
6th grade
7th grade
8th Grade
9th Grade
10th Grade
11th Grade
12th Grade
Submit
Related Videos
MATHEMATICS
Watch in App
Explore more
Distance Formula
Standard XII Mathematics
Join BYJU'S Learning Program
Grade/Exam
1st Grade
2nd Grade
3rd Grade
4th Grade
5th Grade
6th grade
7th grade
8th Grade
9th Grade
10th Grade
11th Grade
12th Grade
Submit
AI Tutor
Textbooks
Question Papers
Install app