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infoWhy this? Domain, range, composition, and inverse functions give us a connected understanding of how functions operate and when their outputs are meaningful. Trigonometric relationships and models allow us to analyse repeated patterns, such as waves and seasonal variation, through features including amplitude, period, and phase.

scheduleWhy now? Year 12 graph transformations and the preceding work on radians and trigonometric functions provide the foundation for interpreting and constructing periodic models. Formalising function structure, particularly composition, also prepares us for the chain rule and the broader differentiation techniques that follow.