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

derivatives 
Reiny,
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 
derivatives 
hannah,
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.

derivatives 
Reiny,
I did use the chain rule in finding the derivative of
(csc x)^7 
derivatives 
hannah,
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.