Solve the Problem for the Given Information $I$ And the Positive $x$

Solve the problem for the given information.
-Find the equation of a line passing through the origin so that the cosine of the angle between the line in quadrant $I$ and the positive $x$ -axis is $\frac { 1 } { 2 }$ .

A) $y = \frac { \sqrt { 3 } } { 2 } x$
B) $y = \frac { 1 } { 2 } x$
C) $y = \frac { \sqrt { 3 } } { 3 } x$
D) $y = \sqrt { 3 } x$

Correct Answer:

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