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An orthogonal matrix is...

An orthogonal matrix is

A

`[(cos alpha, 2 sin alpha),(-2 sin alpha, cos alpha)]`

B

`[(cos alpha, sin alpha),(- sin alpha, cos alpha)]`

C

`[(cos alpha, sin alpha),(sin alpha, cos alpha)]`

D

`[(1,1),(1,1)]`

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The correct Answer is:
B
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