If a=2hati-hatj+2hatk and b=-hati+hatj-h...

If `a=2hati-hatj+2hatk and b=-hati+hatj-hatk`, then find a+b. also, find a unit vector along a+b.

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The correct Answer is:

`hati+hatk;(1)/(sqrt(2))hati+(1)/(sqrt(2))hatk`

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