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Transpose of matrix
Question
If
A
=
−
i
0
0
i
, then A' A is equal to
Easy
A
I
B
-iA
C
-I
D
iA
Solution
We have
A
′
A
=
−
i
0
0
i
−
i
0
0
i
=
−
1
0
0
−
1
=
−
I
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