1. The problem statement, all variables and given/known data Find the domain and range of the following function without the use of a calculator: f(x) = sec (pi x/4) 2. Relevant equations As far as I know, this problem doesn't specifically require "equations". Therefore I am leaving this section blank. Not because I am a malicious poster that is trying to break the rules and upset the administration here, but simply because I don't know any equations for this problem. 3. The attempt at a solution I tried flipping this and finding the cosine of 4pi and graphing it. But I failed to come up with a valid graph and was puzzled. I could take a picture of my "graph", but I don't think anyone could read it. Help would be greatly appreciated here.