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If A is an orthogonal matrix, then A1  equals 

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a
AT
b
A
c
A2
d
none of these

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detailed solution

Correct option is A

AAT=I⇒AAT=|I|⇒|A|2=1⇒|A|=±1⇒A−1 exists ⇒AAT=ATA=I⇒A−1=AT


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