The direction cosines of the vector \stackrel{\^}{i}-5 \stackrel{\^}{j}+8 \stackrel{\^}{k} are

Correct Answer is : (13√10,−53√10,83√10)

( {1}/\sqrt{10}, {-5}/\sqrt{10}, {8}/\sqrt{10} )

( {1}/{3\sqrt{10}, {-5}/{3\sqrt{10}, {8}/{3\sqrt{10} )

( \frac{1}{3}, \frac{-5}{3}, \frac{8}{3} )

( {1}/{3\sqrt{10}, {-1}/{3\sqrt{10}, {1}/{3\sqrt{10} )

( {1}/{3\sqrt{10}, { 5}/{3\sqrt{10}, {8}/{3\sqrt{10} )

KEAM 2020 Math Paper

Question : 64 of 120

Marks: +1, -0

The direction cosines of the vector

−5

are

(
1
√10
,
−5
√10
,
8
√10
)
(
1
3√10
,
−5
3√10
,
8
3√10
)
(
1
3
,
−5
3
,
8
3
)
(
1
3√10
,
−1
3√10
,
1
3√10
)
(
1
3√10
,
5
3√10
,
8
3√10
)

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