You know how to differentiate:
a) 3x2
b) 4x3 + 3x2
c) 4/x
d) 2x½
e) (2x + 3)2
What about:
(4x3+3x)6 ???
This is a good, clear explanation of how to use the chain rule.
Here are the answers to the question sheet from the lesson.
Advanced Reading:
This link explains why the chain rule works. (This is way beyond what you need to do at A-Level, so don't worry if you don't get it yet)