If \stackrel{\^}{a} is a unit vector in the x y -plane making an angle 30^\circ with the positive x -axis, then what is \stackrel{\^}{a} equal to ? [NDA-I 2020]

\sqrt{3} \stackrel{\^}{i}+\stackrel{\^}{j}}/{2}

\sqrt{3} \stackrel{\^}{i}-\stackrel{\^}{j}}/{2}

\stackrel{\^}{ {i}+\sqrt3\stackrel{\^}{j}}/{2}

\stackrel{\^}{ {i}-\sqrt3\stackrel{\^}{j}}/{2}

UPSC NDA I and II 2020 Math Solved Paper

Question : 111 of 120

Marks: +1, -0

is a unit vector in the xy -plane making an angle 30° with the positive x -axis, then what is

equal to ?

[NDA-I 2020]

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