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veca*hati=veca*(hati+hatj)=veca*(hati+ha...

`veca*hati=veca*(hati+hatj)=veca*(hati+hatj+hatk)=1` then `veca=`

A

`hati`

B

`hati+hatj-hatk`

C

`hati+hatj`

D

`hati-hatk`

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A
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