Cosx = rad(3)/2 pls i dont understand how to solve

Answer
x = 30° or x = (360 – 30) = 330° for value of (0≤x≥360)

Explanation
The first step is to find the anti-cosine of √3/2.
cos^(-1)⁡〖√3/2〗=30°
So, x=30°
The values of x can be many so a limit has to be given. For one complete cycle, the values of x would be.
Since cosx is positive the value of x must have been in the first quadrant and the 4th quadrant.
So, x = 30° or x = (360 – 30) = 330°

The answer is a. yes, it asks a question that can be answered correctly (by measuring hands).