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Mathematics
Problem
A vector has direction ratios
2
,
−
3
,
6
2,-3,6
2
,
−
3
,
6
. Which of the following sets gives its direction cosines? a)
(
2
49
,
−
3
49
,
6
49
)
(\tfrac{2}{49},\,-\tfrac{3}{49},\,\tfrac{6}{49})
(
49
2
,
−
49
3
,
49
6
)
b)
(
2
7
,
−
3
7
,
6
7
)
(\tfrac{2}{7},\,-\tfrac{3}{7},\,\tfrac{6}{7})
(
7
2
,
−
7
3
,
7
6
)
c)
(
2
,
−
3
,
6
)
(2,-3,6)
(
2
,
−
3
,
6
)
d)
(
2
47
,
−
3
47
,
6
47
)
(\tfrac{2}{\sqrt{47}},\,-\tfrac{3}{\sqrt{47}},\,\tfrac{6}{\sqrt{47}})
(
47
2
,
−
47
3
,
47
6
)
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