Hey.. I'm having some serious problems with the Chain Rule! It's my 2nd day on it and I'm getting a little frustrated on these extra problems I am doing but can't get right...

1. x^2√(9-x^2)

I know this is the product rule but I don't really get it.. Whenever I use the product rule then take the derivative of √(9-x^2) I just get LOST!!!

2. secx^2

I always get the wrong answer everytime and can't figure it out..

h'(x)= secxtanx X 2(secx)

= 2sec^2xtanx

The answer shows up as 2xsecx^2tanx^2

help!! I need help understanding the chain rule and I got no idea how to do problems like these!!