So I'm trying to study for my calc 3 exam, but I have noticed that my book doesn't have many limit questions that use sin/cos/tan, but I know those will likely be on the test. I have tried to google but I can't find many examples that have solutions. Are there any free sites that have problems to help me practice? Also, I can't seem to figure out when to use the squeeze theorem. In general, when do you look for it?