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The vectors vec(a) = 3 hat(i) + x hat(j)...

The vectors `vec(a) = 3 hat(i) + x hat(j) and vec(b) = 2 hat(i) + hat(j) + y hat(k)` are mutually perpendicular. If `|vec(a)| = |vec(b)|`, then `y = +- 2 sqrt(10)`.

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