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Consider two lines in space as L1: vecr1...

Consider two lines in space as `L_1: vecr_1=hatj+2 hatk+lambda(3 hati-hatj -hatk)` and `L_2: vecr_2=4 hati+3 hatj+6 hatk+mu(hati+2 hatk)`. If the shortest distance between these lines is `sqrtd` then `d` equals

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