What you need to be able to do:
Differentiate an algebraic function which is, or can be simplified to, an expression in powers of x.
Differentiate ksin(x), kcos(x).
Differentiate a composite function using the chain rule.
Looking at the last couple of papers, you can probably expect a question early in paper 1 to be a basic differentiation where you'll have to sort out indices or use the chain rule.
2015 Paper 1
2016 Paper 1
2017 Paper 1