Prove that each of the following matrices is an orthogonal matrix by showing that the columns form orthonormal sets. (a) [ ] lv; 1 (c) 1 V3 (e) -- -2 2 2 2 3 3 2 3 1 3 1 2 3 3 1 3 2 3 2 3 (b) [ -] (d) [ -rJ

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