Graphs of sine and cosine curves from the values of their common angle point. Introduction to theta as the independent variable axis. Fluctuating scale means sine waves can be stretched or compressed. Period as length of cycle. Mnemonic to distinguish between sine and cosine curves.
Series introduction including complete video list:
TR-00: [https://youtu.be/U23JMdBIJ0M]
International A level, Intl A Level, IAL, Edexcel, Pearson exam board, CIE, Cambridge exam board, P3, P2, Year 10, Class 11