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If A is an orthogonal matrix, then $| A |$ is

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Correct option is C

As A is an orthogonal matrix, A′A=AA′=In⇒ A′A=AA′=In⇒ A′|A|=1 ⇒ |A||A|=1⇒ |A|2=1 ⇒ |A|=±1

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If A is an orthogonal matrix, then |A| is

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If A is an orthogonal matrix, then $| A |$ is