on the graph of f(x) = cos x and the interval [2pi, 4pi), for what values) of x does f(x) achieve a maximum?

The question is kind of confusing. if it's asking how many variations of answers can you give. then do 4^5 for your answer.this would be something like the first question could be a and the 2nd c or first b next c etc. if you can, ask the teacher for a better confirmation of what it's asking. if i'm assuming correctly what it's asking, it's 625 different variations.

1. 3/6 or 1/22. 1/123. 1/84. 1/105. 2/12 or 1/6