Q 2233512442.     Let ` vec(a) = hat(i) - hat(j), vec(b) = hat(i) + 2hat(j) +2 hat(k) , vec(c) = hat(i) - hat(j) + hat(k)`

and `vec(d) = 2 hat(i) - hat(j) + hat(k)` then the shortest distance between the

lines `vec(r) = vec(a) + t vec(b) ` and `vec(r) = vec(c) +p vec(d)` is `.....................`

A

`-1/sqrt(2)`

B

`1/sqrt(-2)`

C

`1/sqrt(2)`

D

`1/sqrt(3)`

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