Question

I will give a medal if someone will help me explain this question to be cause I have no clue.
The question is:
Consider the graph of the cosine function shown below
a. Find the period and amplitude of the cosine function.
b. At what values of theta for 0 is less than or equal to theta which is less than or equal to 2pi do the maximum value(s), minimum values(s), and zeros occur?

Answer 1

anyone???

Answer 2

where are you stuck?

Answer 3

looks like the function is

\[f(\theta)=4\cos(2\theta)\]