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AP EAMCET Engineering 2014 Code A Solved Paper
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© examsnet.com
Question : 4
Total: 160
If a,b,c and d are real numbers such that
a
2
+
b
2
+
c
2
=
d
2
=
1
and if
A
=
[
a
+
i
b
c
+
i
d
-
c
+
i
d
a
−
i
b
]
then
A
−
1
=
[
a
−
i
b
c
+
i
d
-
c
+
i
d
a
+
i
b
]
[
a
−
i
b
-
c
−
i
d
c
−
i
d
a
+
i
b
]
[
a
+
i
b
c
+
i
d
c
−
i
d
a
−
i
b
]
[
a
+
i
b
-
c
−
i
d
c
−
i
d
a
−
i
b
]
Validate
Solution:
|
A
|
=
1
(
a
+
i
b
)
(
a
−
i
b
)
+
(
c
−
i
d
)
(
c
+
i
d
)
=
1
a
2
+
b
2
+
c
2
+
d
2
=
1
A
−
1
[
a
−
i
b
-
c
−
i
d
c
−
i
d
a
+
i
b
]
© examsnet.com
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