can1/√2,1/√2,1/√2 be a direction cosine of a line
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Correct option is
B
No
No, they can not be the direction cosines of any directed line.
As the sum of square of them is not 1.
As (
3
1
)
2
+(
3
2
)
2
+(
3
−2
)
2
=
3
1+4+4
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