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For given vectors veca=2hati-hatj+2hatka...

For given vectors `veca=2hati-hatj+2hatkandvecb=-hati+hatj-hatk`, find the unit vector in the direction of the vector `veca+vecb`.

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The correct Answer is:
`(1)/(sqrt(2))hati+(1)/(sqrt(2))hatk`
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