If `vecA+veB` is a unit vector along x-axis and `vecA=hati-hatj+hatk`, then what is `vecB`?

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If `vecA+veB` is a unit vector along x-axis and `vecA=hati-hatj+hatk`, then what is `vecB`?
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If `vecA+veB` is a unit vector along x-axis and `vecA=hati-hatj+hatk`, then what is `vecB`?

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