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Mathematics
Mathematics
Problem
13. Find the direction cosines of the vector joining the points
A
(
1
,
2
,
−
3
)
A(1,2,-3)
A
(
1
,
2
,
−
3
)
and
B
(
−
1
,
−
2
,
1
)
\mathrm{B}(-1,-2,1)
B
(
−
1
,
−
2
,
1
)
, directed from A to B .
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