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Find the unit vector in the direction of the vector `vecr_1-vecr_2`, where `vecr_1` = `hati+2hatj+hatk` and `vecr_2` = `3hati+hatj-5hatk`.

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`vecr_1-vecr_2 = hati+2hatj+hatk-3hati-hatj+5hatk`
=`-2hati+hatj+6hatk`
`|vecr_1-vecr_2| = sqrt(4+1+36) = sqrt(41)`
Unit vector along `vecr_1-vecr_2`
= `(-2hati+hatj+6hatk)/sqrt(41) = -2/sqrt(41) hati + 1/sqrt(41) hatj + 6/sqrt(41) hatk`.
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