Question: Determine which of the matrices in are orthogonal. If orthogonal, find the inverse. -2/3 0 5/3 1/3 2/3 2/3 -1/3 2/3 4/3

Determine which of the matrices in are orthogonal. If orthogonal, find the inverse.   

-2/3 0 5/3 1/3 2/3 2/3 -1/3 2/3 4/3

-2/3 0 5/3 1/3 2/3 2/3 -1/3 2/3 4/3

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