SOLUTION
Given the question in the image, the following are the solution steps to answer the question.
STEP 1: Write the given function
[tex]f(x)=arc\cos\frac{x}{2}[/tex]STEP 2: plot the graph of the function
STEP 3: Get the maximum and minimum
From the graph below:
[tex]maximum=(-2,\pi)[/tex]STEP 3: Get the minimum
[tex]minimum=(2,0)[/tex]