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Find the angle between the line vecr = (...

Find the angle between the line `vecr = (hati +2hatj -hatk ) +lambda (hati - hatj +hatk)` and `vecr cdot (2hati - hatj +hatk) = 4.`

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The correct Answer is:
`sin ^(-1)(4/(3sqrt(2)))`
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Find the shortest distance between the lines vecr = 3 hati + 2hatj - 4 hatk + lamda ( hati +2 hatj +2 hatk ) and vecr = 5 hati - 2hatj + mu ( 3hati + 2hatj + 6 hatk) If the lines intersect find their point of intersection

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