This is the question. Please help!
As a matter of fact $\frac{1}{2}$ does not turn into $\frac{\pi}{6}$
Because I do not know what a degree is, I chose to do mathematics using numbers.
I just know and you must learn that if $\cos(\theta)=\frac{1}{2}$ then $\theta=\pm\frac{\pi}{6}$.
That is just a fact of the measure of angles.