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If the direction cosines of a line are k...

If the direction cosines of a line are k,k,k then

A

`k gt 0`

B

`0 lt k lt 1`

C

k = 1

D

`k = 1/sqrt3 or k = (-1)/sqrt3`

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The correct Answer is:
D
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HIMALAYA PUBLICATION-THREE DIMENSIONAL GEOMETRY-QUESTION BANK
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