Find the shortest distance between the lines `bar(r) = (4hat(i) - hat(j)) + lambda (hat(i) + 2hat(j) - 3hat(k))` and `bar(r) = (hat(i) - hat(j) + 2hat(k)) + mu (hat(i) + 4hat(j) - 5hat(k))`

Answer

`(1)/(sqrt(3))`