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Find the unit vectors perpendicular to the vectors. `hati+hatj`, `hati-hatk`

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`(hatixxhatj)xx(hati-hatk)`
= `hatixxhati-hatixxhatk+hatjxxhati-hatjxxhatk`
= `hatj-hatk-hati` = `-hati+hatj-hatk`
therefore `hatn` = `+-((-hati+hatj-hatk)/sqrt3)`
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