and
(ii)
and
(iii)
Answer:
(i)
Let 
be the angle
between the given lines. The direction ratios of given lines are 2, 5, ?3 and
?1, 8, 4
(ii)
Let be the angle
between the given lines. Given equations are
and
i.e.,
and
The
direction ratios of given lines are ?3, ?1, 0 and 1, ?3, 2.
(iii)
Let be the angle
between the given lines. The direction ratios of given lines are 2, 2, 1 and 4,
1, 8.
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