derivatives
posted by hannah .
how do u find the derivative of (csc x)^7 cos 4x???

You should have a list handy for the basic trig function derivatives
so if y = (csc x)^7 cos 4x
dy/dx = 7(csc x)^6 ( csc x)(cotx) + 4sin(4x)
etc 
Thanks. My teacher told us we need to use the chain rule in these problems, and i'm having trouble figuring out when and where to use it.

I did use the chain rule in finding the derivative of
(csc x)^7 
I know. I just realized that I messed up what goes where when I was doing it myself. My problem is applying it to other problems, esp when i also have to use the quotient or product rule.