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Byju's Answer
Standard XII
Mathematics
Orthogonal Matrix
For the given...
Question
For the given orthogonal matrix Q.
Q =
⎡
⎢
⎣
3
/
7
2
/
7
6
/
7
−
6
/
7
3
/
7
2
/
7
2
/
7
6
/
7
−
3
/
7
⎤
⎥
⎦
The inverse is
A
⎡
⎢
⎣
3
/
7
2
/
7
6
/
7
−
6
/
7
3
/
7
2
/
7
2
/
7
6
/
7
−
3
/
7
⎤
⎥
⎦
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B
⎡
⎢
⎣
−
3
/
7
−
2
/
7
−
6
/
7
6
/
7
−
3
/
7
−
2
/
7
−
2
/
7
−
6
/
7
3
/
7
⎤
⎥
⎦
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C
Q
=
⎡
⎢
⎣
3
/
7
−
6
/
7
2
/
7
2
/
7
3
/
7
6
/
7
6
/
7
2
/
7
−
3
/
7
⎤
⎥
⎦
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D
⎡
⎢
⎣
−
3
/
7
−
6
/
7
−
2
/
7
−
2
/
7
−
3
/
7
−
6
/
7
−
6
/
7
−
2
/
7
3
/
7
⎤
⎥
⎦
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Solution
The correct option is
C
Q
=
⎡
⎢
⎣
3
/
7
−
6
/
7
2
/
7
2
/
7
3
/
7
6
/
7
6
/
7
2
/
7
−
3
/
7
⎤
⎥
⎦
∴
A is orthogonal so
Q
Q
T
=
I
⇒
Q
−
T
=
Q
T
Hence
Q
−
1
=
⎡
⎢
⎣
3
/
7
−
6
/
7
2
/
7
2
/
7
3
/
7
6
/
7
6
/
7
2
/
7
−
3
/
7
⎤
⎥
⎦
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Similar questions
Q.
4
7
−
5
7
2
+
4
7
3
−
5
7
4
+
4
7
5
−
5
7
6
+
.
.
.
.
to infinity.
Q.
Without using the concept of inverse of a matrix, find the matrix
x
y
z
u
such that
5
-
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-
2
3
x
y
z
u
=
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6
7
2
Q.
Mark true or false.
(a) (100 + 10) + 5 = 100 + (10 + 5) ____
(b) 100 − (10 − 5) = (100 − 10) − 5 ____
(c) (72 − 36) − 20 = 72 − (36 − 20) ____
(d) (68 × 4) × 20 = 68 × (4 × 20) ____
(e) 7(6 − 3) = 7 × 6 − 7 × 3 ____
(f) 20 × 30 = 30 × 20 ____
(g) 87 − 41 = 41 − 87 ____
(h) 16 × 4 = 4 × 16 ____
(i) 480 + 0 = 0 + 480 ____
(j) (16 + 7) + 3 = 16 + (7 + 3) ____
Q.
Calculate the sum of series
1
7
+
2
7
2
+
3
7
3
+
.
.
.
.
.
.
.
.
.
upto infinity.
Q.
[
(
5
7
)
2
]
3
×
7
6
÷
(
5
3
)
2
is equal to ____.
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