I'm completely lost here. I've got the cheat sheet of trig rules, but they don't appear to be helping me, I've watched a half dozen videos on each of cos sin and tan, and nearly all of them discuss the wrong topic. I don't want help on any single problem, but advice. How can I make sense of the trig equations in relation to the trig identities? I realize there is supposed to be a pattern of some sort but I do not see it. I'm close to telling my professor I just give up, and dropping out completely.