#3.2A
understand the concept that a function is a mapping between elements of two sets
#3.2B
use function notations of the form \(f(x) = ...\) and \(f : x \mapsto ...\)
#3.2C
understand the terms ‘domain’ and ‘range’ and which values may need to be excluded from a domain
\(f(x) = \dfrac{1}{x-2} \) exclude \(~x=2\)
#3.2D
understand and find the composite function \(fg\) and the inverse function \(f^{-1}\)
‘\(fg\)’ will mean ‘do \(g\) first, then \(f\)’