What are the direction cosines of \overrightarrow{{r}} ?

Correct Answer is : [12,√32,0]

[ \frac{1}{2}, {\\sqrt{3}/{2}, 0\]

[ \frac{1}{2}, {\-\sqrt{3}/{2}, 0\]

[ \frac{1}{\sqrt2}, { {1}}/{\sqrt2}, 0\]

[ -\frac{1}{2}, {\\sqrt{3}/{2}, 0\]

UPSC NDA Math Model Paper 4

Question : 107 of 120

Marks: +1, -0

What are the direction cosines of

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