Does anyone have advice on resources to help me quickly refresh my memory of Trig? A website giving a basic rundown of how it works would probably be good enough to jog my memory. The problem I'm running into right now is that I'm given problems such as "find the limit as x approaches 0 of x^4cos(2/x)" and I can't figure out what to do with a cosine being involved. I get limits, and x^4 is no problem, but I stare and stare and poke and poke my brain to no avail trying to reveal something in the depths of that little "cos."

Help?

I'll give you an e-cookie. ^^''

- Mood: mathematical
- Location:Cambridge, MA