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Mathematics
Mathematics
Problem
Which of the following ordered triples can represent the direction cosines of a vector? a)
(
1
2
,
1
2
,
1
2
)
(\tfrac{1}{2},\,\tfrac{1}{2},\,\tfrac{1}{2})
(
2
1
,
2
1
,
2
1
)
b)
(
0.8
,
0.6
,
0.1
)
(0.8,\,0.6,\,0.1)
(
0.8
,
0.6
,
0.1
)
c)
(
3
5
,
4
5
,
0
)
(\tfrac{3}{5},\,\tfrac{4}{5},\,0)
(
5
3
,
5
4
,
0
)
d)
(
0.2
,
0.3
,
0.5
)
(0.2,\,0.3,\,0.5)
(
0.2
,
0.3
,
0.5
)
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