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The length of the perpendicular drawn fr...

The length of the perpendicular drawn from the point `(2,1,4)` to the plane containing the lines
`vec(r) = (hati +hatj) +lambda (hati +2 hatj - hatk)` and `vec(r) = (hati +hatj) +mu (-hati +hatj - 2hatk)` is:

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