Inverse functions are like untying a knot. You will be successful when you follow the exact same steps as before, but now in the exact reverse order. What is the best strategy to do this? Follow the links below to learn all you need to know about Functions to pass your IGCSE GCSE Maths exam. I will First of all explain to you how to evaluate functions by substitution. In the second part I will explain what inverse functions are and how you can find the inverse of a function. Finally I will discuss what composite functions are and how you can find your own composite function. I explain all maths topics by providing you with many example questions and I will tell you step by step how to approach each type of question. So start your maths revision now and follow the links below. I will see you there!!