2.7. Which of the following matrices are orthogonal? Compute the matrix inverses of those that are orthogonal.

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2.7. Which of the following matrices are orthogonal? Compute the matrix inverses of those that are orthogonal.

a.

0 1 0 0 0 1 1 0 0

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, b.

0 0 1 0 1 0 1 0 0

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, c.

1 1 1 1 1 1 1 1 1

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, d.

1 0 0 0 2 0 0 0 3

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, e.

1 2 3 2 1 2 3 2 1

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