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Question

If A=[−i00i], then A′A is equal to

A
I
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B
iA
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C
I
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D
iA
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Solution

The correct option is B I
A=[i00i]
A=[i00i], since A is a symmetric matrix
AA=[i00i][i00i]=[i200i2]=[1001]=[1001]=I
Since i2=1

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