understand the concept of the derivative as a function
recognise and use properties of the derivative 𝑑/𝑑x [𝑓(𝑥)+𝑔(𝑥)]=𝑑/𝑑x 𝑓(𝑥) + 𝑑/𝑑x 𝑔(𝑥)
calculate derivatives of power and polynomial functions
