If \( \mathrm{A}=\frac{1}{3}\left|\begin{array}{ccc}1 & 2 & 2 \\ 2 & 1 & -2 \\ \mathrm{a} & 2 & ...

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If \( \mathrm{A}=\frac{1}{3}\left|\begin{array}{ccc}1 & 2 & 2 \\ 2 & 1 & -2 \\ \mathrm{a} & 2 & \mathrm{~b}\end{array}\right| \) is a orthogonal matrix, then the
P
W value of \( (a+b) \) is equal to
(1) 0
(2) \( \pm 1 \)
(3) 3
(4) \( -3 \)
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