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Find the unit vector in the direction of...

Find the unit vector in the direction of `3 hat i-6 hat j+2 hat k` .

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l=`3 hat i-6 hat j+2 hat k`
`mod(l)=sqrt(3^2+6^2+2^2)`
`mod(l)=7`
so,
unit vector in direction is,
(`3 hat i-6 hat j+2 hat k)/(7)`
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