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Let veca=hati-hatk, vecb=xhati+hatj+(1-x...

Let `veca=hati-hatk, vecb=xhati+hatj+(1-x)hatk` and `vecc=yhati+xhatj+(1+x-y)hatk`, then `[veca vecb vecc]` depends on

A

only `x`

B

only `y`

C

neither `x` nor `y`

D

both `x` and `y`

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